Bug 1484496: Part 5e - Convert remaining nsISimpleEnumerator users to use JS iteration. r=mccr8

Differential Revision: https://phabricator.services.mozilla.com/D3733

--HG--
extra : rebase_source : c0fac176d7b3d840c4dbb14f8d95ccfc7f83a5a8
extra : histedit_source : a92c40117d0808a3ad68c972f622a7a42c9ae8ba

accessible/jsat/AccessFu.jsm

@@ -67,9 +67,8 @@ var AccessFu = {
     Services.obs.addObserver(this, "inprocess-browser-shown");
     Services.ww.registerNotification(this);
 
-    let windows = Services.wm.getEnumerator(null);
+    for (let win of Services.wm.getEnumerator(null)) {
-    while (windows.hasMoreElements()) {
+      this._attachWindow(win);
-      this._attachWindow(windows.getNext());
     }
 
     Logger.info("AccessFu:Enabled");
@@ -89,9 +88,8 @@ var AccessFu = {
     Services.obs.removeObserver(this, "inprocess-browser-shown");
     Services.ww.unregisterNotification(this);
 
-    let windows = Services.wm.getEnumerator(null);
+    for (let win of Services.wm.getEnumerator(null)) {
-    while (windows.hasMoreElements()) {
+      this._detachWindow(win);
-      this._detachWindow(windows.getNext());
     }
 
     delete this._notifyOutputPref;

accessible/jsat/Utils.jsm

@@ -160,13 +160,9 @@ var Utils = { // jshint ignore:line
     let attributes = {};
 
     if (aAccessible && aAccessible.attributes) {
-      let attributesEnum = aAccessible.attributes.enumerate();
-
       // Populate |attributes| object with |aAccessible|'s attribute key-value
       // pairs.
-      while (attributesEnum.hasMoreElements()) {
+      for (let attribute of aAccessible.attributes.enumerate()) {
-        let attribute = attributesEnum.getNext().QueryInterface(
-          Ci.nsIPropertyElement);
         attributes[attribute.key] = attribute.value;
       }
     }
@@ -757,9 +753,8 @@ PivotContext.prototype = {
       }
     };
     let getHeaders = function* getHeaders(aHeaderCells) {
-      let enumerator = aHeaderCells.enumerate();
+      for (let {name} of aHeaderCells.enumerate(Ci.nsIAccessible)) {
-      while (enumerator.hasMoreElements()) {
+        yield name;
-        yield enumerator.getNext().QueryInterface(Ci.nsIAccessible).name;
       }
     };
 

accessible/tests/browser/shared-head.js

@@ -246,11 +246,8 @@ function addAccessibleTask(doc, task) {
     }
 
     registerCleanupFunction(() => {
-      let observers = Services.obs.enumerateObservers("accessible-event");
+      for (let observer of Services.obs.enumerateObservers("accessible-event")) {
-      while (observers.hasMoreElements()) {
+        Services.obs.removeObserver(observer, "accessible-event");
-        Services.obs.removeObserver(
-          observers.getNext().QueryInterface(Ci.nsIObserver),
-          "accessible-event");
       }
     });
 

accessible/tests/mochitest/attributes.js

@@ -319,10 +319,7 @@ function testAttrsInternal(aAccOrElmOrID, aAttrs, aSkipUnexpectedAttrs,
 function compareAttrs(aErrorMsg, aAttrs, aExpectedAttrs, aSkipUnexpectedAttrs,
                       aAbsentAttrs) {
   // Check if all obtained attributes are expected and have expected value.
-  var enumerate = aAttrs.enumerate();
+  for (let prop of aAttrs.enumerate()) {
-  while (enumerate.hasMoreElements()) {
-    let prop = enumerate.getNext().QueryInterface(nsIPropertyElement);
-
     if (!(prop.key in aExpectedAttrs)) {
       if (!aSkipUnexpectedAttrs)
         ok(false, "Unexpected attribute '" + prop.key + "' having '" +
@@ -355,9 +352,7 @@ function compareAttrs(aErrorMsg, aAttrs, aExpectedAttrs, aSkipUnexpectedAttrs,
     for (var name in aAbsentAttrs) {
       var wasFound = false;
 
-      enumerate = aAttrs.enumerate();
+      for (let prop of aAttrs.enumerate()) {
-      while (enumerate.hasMoreElements()) {
-        let prop = enumerate.getNext().QueryInterface(nsIPropertyElement);
         if (prop.key == name)
           wasFound = true;
       }

accessible/tests/mochitest/relations.js

@@ -76,9 +76,7 @@ function testRelation(aIdentifier, aRelType, aRelatedIdentifiers) {
   // Check if all given related accessibles are targets of obtained relation.
   for (let idx = 0; idx < targets.length; idx++) {
     var isFound = false;
-    let enumerate = actualTargets.enumerate();
+    for (let relatedAcc of actualTargets.enumerate(Ci.nsIAccessible)) {
-    while (enumerate.hasMoreElements()) {
-      let relatedAcc = enumerate.getNext().QueryInterface(nsIAccessible);
       if (targets[idx] == relatedAcc) {
         isFound = true;
         break;
@@ -89,9 +87,7 @@ function testRelation(aIdentifier, aRelType, aRelatedIdentifiers) {
   }
 
   // Check if all obtained targets are given related accessibles.
-  let enumerate = actualTargets.enumerate();
+  for (let relatedAcc of actualTargets.enumerate(Ci.nsIAccessible)) {
-  while (enumerate.hasMoreElements()) {
-    let relatedAcc = enumerate.getNext().QueryInterface(nsIAccessible);
     let idx;
     for (idx = 0; idx < targets.length && relatedAcc != targets[idx]; idx++);
 
@@ -140,9 +136,7 @@ function testAbsentRelation(aIdentifier, aRelType, aUnrelatedIdentifiers) {
   // Any found targets that match given accessibles should be called out.
   for (let idx = 0; idx < targets.length; idx++) {
     var notFound = true;
-    var enumerate = actualTargets.enumerate();
+    for (let relatedAcc of actualTargets.enumerate(Ci.nsIAccessible)) {
-    while (enumerate.hasMoreElements()) {
-      var relatedAcc = enumerate.getNext().QueryInterface(nsIAccessible);
       if (targets[idx] == relatedAcc) {
         notFound = false;
         break;

docshell/test/browser/file_bug1328501_framescript.js

@@ -31,10 +31,5 @@ function getChildDocShells() {
     Ci.nsIDocShell.ENUMERATE_FORWARDS
   );
 
-  let docShells = [];
+  return Array.from(docShellsEnum);
-  while (docShellsEnum.hasMoreElements()) {
-    let ds = docShellsEnum.getNext();
-    docShells.push(ds);
-  }
-  return docShells;
 }

docshell/test/navigation/NavigationUtils.js

@@ -102,12 +102,10 @@ function xpcEnumerateContentWindows(callback) {
   var Ci = SpecialPowers.Ci;
   var ww = SpecialPowers.Cc["@mozilla.org/embedcomp/window-watcher;1"]
                         .getService(Ci.nsIWindowWatcher);
-  var enumerator = ww.getWindowEnumerator();
 
   var contentWindows = [];
 
-  while (enumerator.hasMoreElements()) {
+  for (let win of ww.getWindowEnumerator()) {
-    var win = enumerator.getNext();
     if (win.isChromeWindow) {
       var docshellTreeNode = win.docShell;
       var childCount = docshellTreeNode.childCount;

dom/html/test/file_cookiemanager.js

@@ -3,9 +3,7 @@ addMessageListener("getCookieFromManager", ({ host, path }) => {
              .getService(Ci.nsICookieManager);
   let values = [];
   path = path.substring(0, path.lastIndexOf("/") + 1);
-  let e = cm.enumerator;
+  for (let cookie of cm.enumerator) {
-  while (e.hasMoreElements()) {
-    let cookie = e.getNext().QueryInterface(Ci.nsICookie);
     if (!cookie) {
       break;
     }

dom/payments/test/CleanupChromeScript.js

@@ -28,20 +28,16 @@ var setPaymentNums = 0;
 
 addMessageListener("payment-num-set", function() {
   setPaymentNums = 0;
-  const paymentEnum = paymentSrv.enumerate();
+  for (let payment of paymentSrv.enumerate()) {
-  while (paymentEnum.hasMoreElements()) {
     setPaymentNums = setPaymentNums + 1;
-    paymentEnum.getNext();
   }
   sendAsyncMessage("payment-num-set-complete");
 });
 
 addMessageListener("payment-num-check", function(expectedNumPayments) {
-  const paymentEnum = paymentSrv.enumerate();
   let numPayments = 0;
-  while (paymentEnum.hasMoreElements()) {
+  for (let payment of paymentSrv.enumerate()) {
     numPayments = numPayments + 1;
-    paymentEnum.getNext();
   }
   if (numPayments !== expectedNumPayments + setPaymentNums) {
     emitTestFail("Expected '" + expectedNumPayments +

dom/payments/test/ConstructorChromeScript.js

@@ -353,8 +353,7 @@ function checkSimplestRequestHandler() {
   if (!paymentEnum.hasMoreElements()) {
     emitTestFail("PaymentRequestService should have at least one payment request.");
   }
-  while (paymentEnum.hasMoreElements()) {
+  for (let payRequest of paymentEnum) {
-    let payRequest = paymentEnum.getNext().QueryInterface(Ci.nsIPaymentRequest);
     if (!payRequest) {
       emitTestFail("Fail to get existing payment request.");
       break;
@@ -370,8 +369,7 @@ function checkComplexRequestHandler() {
   if (!paymentEnum.hasMoreElements()) {
     emitTestFail("PaymentRequestService should have at least one payment request.");
   }
-  while (paymentEnum.hasMoreElements()) {
+  for (let payRequest of paymentEnum) {
-    let payRequest = paymentEnum.getNext().QueryInterface(Ci.nsIPaymentRequest);
     if (!payRequest) {
       emitTestFail("Fail to get existing payment request.");
       break;
@@ -387,8 +385,7 @@ function checkNonBasicCardRequestHandler() {
   if (!paymentEnum.hasMoreElements()) {
     emitTestFail("PaymentRequestService should have at least one payment request.");
   }
-  while (paymentEnum.hasMoreElements()) {
+  for (let payRequest of paymentEnum) {
-    let payRequest = paymentEnum.getNext().QueryInterface(Ci.nsIPaymentRequest);
     if (!payRequest) {
       emitTestFail("Fail to get existing payment request.");
       break;
@@ -404,8 +401,7 @@ function checkMultipleRequestsHandler () {
   if (!paymentEnum.hasMoreElements()) {
     emitTestFail("PaymentRequestService should have at least one payment request.");
   }
-  while (paymentEnum.hasMoreElements()) {
+  for (let payRequest of paymentEnum) {
-    let payRequest = paymentEnum.getNext().QueryInterface(Ci.nsIPaymentRequest);
     if (!payRequest) {
       emitTestFail("Fail to get existing payment request.");
       break;
@@ -425,8 +421,7 @@ function checkCrossOriginTopLevelPrincipalHandler() {
   if (!paymentEnum.hasMoreElements()) {
     emitTestFail("PaymentRequestService should have at least one payment request.");
   }
-  while (paymentEnum.hasMoreElements()) {
+  for (let payRequest of paymentEnum) {
-    let payRequest = paymentEnum.getNext().QueryInterface(Ci.nsIPaymentRequest);
     if (!payRequest) {
       emitTestFail("Fail to get existing payment request.");
       break;

dom/payments/test/CurrencyAmountValidationChromeScript.js

@@ -36,10 +36,7 @@ function checkLowerCaseCurrency() {
       "PaymentRequestService should have at least one payment request.";
     sendAsyncMessage("test-fail", msg);
   }
-  while (paymentEnum.hasMoreElements()) {
+  for (let payRequest of paymentEnum) {
-    const payRequest = paymentEnum
-      .getNext()
-      .QueryInterface(Ci.nsIPaymentRequest);
     if (!payRequest) {
       sendAsyncMessage("test-fail", "Fail to get existing payment request.");
       break;

dom/payments/test/browser_payment_in_different_tabs.js

@@ -17,15 +17,13 @@ add_task(async () => {
   const paymentSrv = Cc[
     "@mozilla.org/dom/payments/payment-request-service;1"
   ].getService(Ci.nsIPaymentRequestService);
-  ok(paymentSrv, "Fail to get PaymentRequestService.");
   const paymentEnum = paymentSrv.enumerate();
   ok(
     paymentEnum.hasMoreElements(),
     "PaymentRequestService should have at least one payment request."
   );
   const payments = new Set();
-  while (paymentEnum.hasMoreElements()) {
+  for (let payment of paymentEnum) {
-    const payment = paymentEnum.getNext().QueryInterface(Ci.nsIPaymentRequest);
     ok(payment, "Fail to get existing payment request.");
     checkSimplePayment(payment);
     payments.add(payment);

dom/plugins/test/unit/head_plugins.js

@@ -16,9 +16,7 @@ function allow_all_plugins() {
 
 // Finds the test plugin library
 function get_test_plugin(secondplugin=false) {
-  var pluginEnum = gDirSvc.get("APluginsDL", Ci.nsISimpleEnumerator);
+  for (let dir of gDirSvc.get("APluginsDL", Ci.nsISimpleEnumerator)) {
-  while (pluginEnum.hasMoreElements()) {
-    let dir = pluginEnum.getNext().QueryInterface(Ci.nsIFile);
     let name = get_platform_specific_plugin_name(secondplugin);
     let plugin = dir.clone();
     plugin.append(name);
@@ -100,9 +98,7 @@ function get_platform_specific_plugin_suffix() {
 function get_test_plugin_no_symlink() {
   let dirSvc = Cc["@mozilla.org/file/directory_service;1"]
                 .getService(Ci.nsIProperties);
-  let pluginEnum = dirSvc.get("APluginsDL", Ci.nsISimpleEnumerator);
+  for (let dir of dirSvc.get("APluginsDL", Ci.nsISimpleEnumerator)) {
-  while (pluginEnum.hasMoreElements()) {
-    let dir = pluginEnum.getNext().QueryInterface(Ci.nsIFile);
     let plugin = dir.clone();
     plugin.append(get_platform_specific_plugin_name());
     if (plugin.exists()) {

dom/push/PushRecord.jsm

@@ -182,9 +182,7 @@ PushRecord.prototype = {
   },
 
   isTabOpen() {
-    let windows = Services.wm.getEnumerator("navigator:browser");
+    for (let window of Services.wm.getEnumerator("navigator:browser")) {
-    while (windows.hasMoreElements()) {
-      let window = windows.getNext();
       if (window.closed || PrivateBrowsingUtils.isWindowPrivate(window)) {
         continue;
       }

dom/workers/test/dom_worker_helper.js

@@ -38,12 +38,8 @@ function assertThrows(fun, message) {
   ok(throws, message);
 }
 
-function* generateDebuggers() {
+function generateDebuggers() {
-  let e = wdm.getWorkerDebuggerEnumerator();
+  return wdm.getWorkerDebuggerEnumerator();
-  while (e.hasMoreElements()) {
-    let dbg = e.getNext().QueryInterface(Ci.nsIWorkerDebugger);
-    yield dbg;
-  }
 }
 
 function findDebugger(url) {

extensions/cookie/test/file_chromecommon.js

@@ -3,7 +3,7 @@ let cs = Cc["@mozilla.org/cookiemanager;1"]
 
 addMessageListener("getCookieCountAndClear", () => {
   let count = 0;
-  for (let list = cs.enumerator; list.hasMoreElements(); list.getNext())
+  for (let cookie of cs.enumerator)
     ++count;
   cs.removeAll();
 

extensions/cookie/test/file_testloadflags_chromescript.js

@@ -62,9 +62,7 @@ obs.prototype = {
 
 function getCookieCount(cs) {
   let count = 0;
-  let list = cs.enumerator;
+  for (let cookie of cs.enumerator) {
-  while (list.hasMoreElements()) {
-    let cookie = list.getNext().QueryInterface(Ci.nsICookie);
     info("cookie: " + cookie);
     info("cookie host " + cookie.host + " path " + cookie.path + " name " + cookie.name +
          " value " + cookie.value + " isSecure " + cookie.isSecure + " expires " + cookie.expires);

extensions/cookie/test/unit/head_cookies.js

@@ -123,8 +123,8 @@ function do_set_cookies(uri, channel, session, expected) {
 
 function do_count_enumerator(enumerator) {
   let i = 0;
-  while (enumerator.hasMoreElements()) {
+  for (let cookie of enumerator) {
-    enumerator.getNext();
+    void cookie;
     ++i;
   }
   return i;

extensions/cookie/test/unit/test_bug526789.js

@@ -185,10 +185,7 @@ function run_test() {
 function getCookieCount() {
   var count = 0;
   var cm = Cc["@mozilla.org/cookiemanager;1"].getService(Ci.nsICookieManager);
-  var enumerator = cm.enumerator;
+  for (let cookie of cm.enumerator) {
-  while (enumerator.hasMoreElements()) {
-    if (!(enumerator.getNext() instanceof Ci.nsICookie2))
-      throw new Error("not a cookie");
     ++count;
   }
   return count;

extensions/cookie/test/unit/test_domain_eviction.js

@@ -56,10 +56,7 @@ function* do_run_test()
   setCookies("tasty.horse.radish", 50, futureExpiry);
   Assert.equal(countCookies("horse.radish", "horse.radish"), 50);
 
-  let enumerator = Services.cookiemgr.enumerator;
+  for (let cookie of Services.cookiemgr.enumerator) {
-  while (enumerator.hasMoreElements()) {
-    let cookie = enumerator.getNext().QueryInterface(Ci.nsICookie2);
-
     if (cookie.host == "horse.radish")
       do_throw("cookies not evicted by lastAccessed order");
   }
@@ -77,9 +74,7 @@ function* do_run_test()
     false, false, false, futureExpiry, {});
   Assert.equal(countCookies("captchart.com", "captchart.com"), 50);
 
-  enumerator = Services.cookiemgr.getCookiesFromHost("captchart.com", {});
+  for (let cookie of Services.cookiemgr.getCookiesFromHost("captchart.com", {})) {
-  while (enumerator.hasMoreElements()) {
-    let cookie = enumerator.getNext().QueryInterface(Ci.nsICookie2);
     Assert.ok(cookie.expiry == futureExpiry);
   }
 
@@ -104,14 +99,10 @@ setCookies(aHost, aNumber, aExpiry)
 function
 countCookies(aBaseDomain, aHost)
 {
-  let enumerator = Services.cookiemgr.enumerator;
-
   // count how many cookies are within domain 'aBaseDomain' using the cookie
   // enumerator.
   let cookies = [];
-  while (enumerator.hasMoreElements()) {
+  for (let cookie of Services.cookiemgr.enumerator) {
-    let cookie = enumerator.getNext().QueryInterface(Ci.nsICookie2);
-
     if (cookie.host.length >= aBaseDomain.length &&
         cookie.host.slice(cookie.host.length - aBaseDomain.length) == aBaseDomain)
       cookies.push(cookie);
@@ -123,10 +114,7 @@ countCookies(aBaseDomain, aHost)
     cookies.length);
   Assert.equal(Services.cookiemgr.countCookiesFromHost(aHost), cookies.length);
 
-  enumerator = Services.cookiemgr.getCookiesFromHost(aHost, {});
+  for (let cookie of Services.cookiemgr.getCookiesFromHost(aHost, {})) {
-  while (enumerator.hasMoreElements()) {
-    let cookie = enumerator.getNext().QueryInterface(Ci.nsICookie2);
-
     if (cookie.host.length >= aBaseDomain.length &&
         cookie.host.slice(cookie.host.length - aBaseDomain.length) == aBaseDomain) {
       let found = false;

extensions/cookie/test/unit/test_eviction.js

@@ -231,11 +231,8 @@ function get_creationTime(i)
 // time, if both the limit on total cookies (maxNumber + 10%) and the purge age
 // + 10% are exceeded.
 function check_remaining_cookies(aNumberTotal, aNumberOld, aNumberToExpect) {
-  var enumerator = Services.cookiemgr.enumerator;
-
   let i = 0;
-  while (enumerator.hasMoreElements()) {
+  for (let cookie of Services.cookiemgr.enumerator) {
-    var cookie = enumerator.getNext().QueryInterface(Ci.nsICookie2);
     ++i;
 
     if (aNumberTotal != aNumberToExpect) {

extensions/cookie/test/unit/test_permmanager_defaults.js

@@ -215,9 +215,7 @@ add_task(async function do_test() {
 // be found.
 function findCapabilityViaEnum(origin = TEST_ORIGIN, type = TEST_PERMISSION) {
   let result = undefined;
-  let e = Services.perms.enumerator;
+  for (let perm of Services.perms.enumerator) {
-  while (e.hasMoreElements()) {
-    let perm = e.getNext().QueryInterface(Ci.nsIPermission);
     if (perm.matchesURI(origin, true) &&
         perm.type == type) {
       if (result !== undefined) {

extensions/cookie/test/unit/test_permmanager_migrate_4-7.js

@@ -159,9 +159,7 @@ add_task(async function test() {
   await PlacesTestUtils.addVisits(Services.io.newURI("ftp://some.subdomain.of.foo.com:8000/some/subdirectory"));
 
   // Force initialization of the nsPermissionManager
-  let enumerator = Services.perms.enumerator;
+  for (let permission of Services.perms.enumerator) {
-  while (enumerator.hasMoreElements()) {
-    let permission = enumerator.getNext().QueryInterface(Ci.nsIPermission);
     let isExpected = false;
 
     expected.forEach((it, i) => {

extensions/cookie/test/unit/test_permmanager_migrate_4-7_no_history.js

@@ -176,9 +176,7 @@ add_task(function test() {
   let found = expected.map((it) => 0);
 
   // Force initialization of the nsPermissionManager
-  let enumerator = Services.perms.enumerator;
+  for (let permission of Services.perms.enumerator) {
-  while (enumerator.hasMoreElements()) {
-    let permission = enumerator.getNext().QueryInterface(Ci.nsIPermission);
     let isExpected = false;
 
     expected.forEach((it, i) => {

extensions/cookie/test/unit/test_permmanager_migrate_5-7a.js

@@ -218,9 +218,7 @@ add_task(async function test() {
   await PlacesTestUtils.addVisits(Services.io.newURI("ftp://some.subdomain.of.foo.com:8000/some/subdirectory"));
 
   // Force initialization of the nsPermissionManager
-  let enumerator = Services.perms.enumerator;
+  for (let permission of Services.perms.enumerator) {
-  while (enumerator.hasMoreElements()) {
-    let permission = enumerator.getNext().QueryInterface(Ci.nsIPermission);
     let isExpected = false;
 
     expected.forEach((it, i) => {

extensions/cookie/test/unit/test_permmanager_migrate_5-7b.js

@@ -100,9 +100,7 @@ add_task(function test() {
   let found = expected.map((it) => 0);
 
   // Force initialization of the nsPermissionManager
-  let enumerator = Services.perms.enumerator;
+  for (let permission of Services.perms.enumerator) {
-  while (enumerator.hasMoreElements()) {
-    let permission = enumerator.getNext().QueryInterface(Ci.nsIPermission);
     let isExpected = false;
 
     expected.forEach((it, i) => {

extensions/cookie/test/unit/test_permmanager_migrate_6-7a.js

@@ -218,9 +218,7 @@ add_task(async function test() {
   await PlacesTestUtils.addVisits(Services.io.newURI("ftp://some.subdomain.of.foo.com:8000/some/subdirectory"));
 
   // Force initialization of the nsPermissionManager
-  let enumerator = Services.perms.enumerator;
+  for (let permission of Services.perms.enumerator) {
-  while (enumerator.hasMoreElements()) {
-    let permission = enumerator.getNext().QueryInterface(Ci.nsIPermission);
     let isExpected = false;
 
     expected.forEach((it, i) => {

extensions/cookie/test/unit/test_permmanager_migrate_6-7b.js

@@ -94,9 +94,7 @@ add_task(function test() {
   let found = expected.map((it) => 0);
 
   // Force initialization of the nsPermissionManager
-  let enumerator = Services.perms.enumerator;
+  for (let permission of Services.perms.enumerator) {
-  while (enumerator.hasMoreElements()) {
-    let permission = enumerator.getNext().QueryInterface(Ci.nsIPermission);
     let isExpected = false;
 
     expected.forEach((it, i) => {

extensions/cookie/test/unit/test_permmanager_migrate_7-8.js

@@ -198,9 +198,7 @@ add_task(async function test() {
   await PlacesTestUtils.addVisits(Services.io.newURI("https://localhost:8080"));
 
   // Force initialization of the nsPermissionManager
-  let enumerator = Services.perms.enumerator;
+  for (let permission of Services.perms.enumerator) {
-  while (enumerator.hasMoreElements()) {
-    let permission = enumerator.getNext().QueryInterface(Ci.nsIPermission);
     let isExpected = false;
 
     expected.forEach((it, i) => {

js/xpconnect/loader/XPCOMUtils.jsm

@@ -413,10 +413,9 @@ var XPCOMUtils = {
    * @param e The nsISimpleEnumerator to iterate over.
    * @param i The expected interface for each element.
    */
-  IterSimpleEnumerator: function* XPCU_IterSimpleEnumerator(e, i)
+  IterSimpleEnumerator: function XPCU_IterSimpleEnumerator(e, i)
   {
-    while (e.hasMoreElements())
+    return e.entries(i);
-      yield e.getNext().QueryInterface(i);
   },
 
   /**
@@ -437,7 +436,7 @@ var XPCOMUtils = {
   enumerateCategoryEntries: function* XPCOMUtils_enumerateCategoryEntries(aCategory)
   {
     let category = this.categoryManager.enumerateCategory(aCategory);
-    for (let entry of this.IterSimpleEnumerator(category, Ci.nsISupportsCString)) {
+    for (let entry of category) {
       yield [entry.data, this.categoryManager.getCategoryEntry(aCategory, entry.data)];
     }
   },

layout/tools/reftest/bootstrap.js

@@ -24,9 +24,7 @@ var WindowListener = {
     let win = xulWin.docShell.domWindow;
     win.addEventListener("load", function listener() {
       // Load into any existing windows.
-      let windows = Services.wm.getEnumerator("navigator:browser");
+      for (win of Services.wm.getEnumerator("navigator:browser")) {
-      while (windows.hasMoreElements()) {
-        win = windows.getNext().QueryInterface(Ci.nsIDOMWindow);
         break;
       }
 

netwerk/cookie/test/browser/browser_originattributes.js

@@ -84,8 +84,7 @@ async function checkCookies(expectedValues, time) {
 function getCookiesFromManager(userContextId) {
   let cookies = {};
   let enumerator = cm.getCookiesWithOriginAttributes(JSON.stringify({userContextId}));
-  while (enumerator.hasMoreElements()) {
+  for (let cookie of enumerator) {
-    let cookie = enumerator.getNext().QueryInterface(Ci.nsICookie);
     cookies[cookie.name] = cookie.value;
   }
   return cookies;

netwerk/cookie/test/unit/test_bug1267910.js

@@ -55,12 +55,10 @@ function checkCookie(cookie, cookieObj) {
 
 function countCookies(enumerator) {
   let cnt = 0;
-
+  for (let cookie of enumerator) {
-  while (enumerator.hasMoreElements()) {
+    void cookie;
     cnt++;
-    enumerator.getNext();
   }
-
   return cnt;
 }
 

netwerk/cookie/test/unit/test_eviction.js

@@ -223,10 +223,8 @@ async function test_basic_eviction(base_host, subdomain_host, other_subdomain_ho
 // Verify that the given cookie names exist, and are ordered from least to most recently accessed
 function verifyCookies(names, uri) {
     Assert.equal(cm.countCookiesFromHost(uri.host), names.length);
-    let cookies = cm.getCookiesFromHost(uri.host, {});
     let actual_cookies = [];
-    while (cookies.hasMoreElements()) {
+    for (let cookie of cm.getCookiesFromHost(uri.host, {})) {
-        let cookie = cookies.getNext().QueryInterface(Ci.nsICookie2);
         actual_cookies.push(cookie);
     }
     if (names.length != actual_cookies.length) {

netwerk/dns/mdns/libmdns/MulticastDNSAndroid.jsm

@@ -146,9 +146,7 @@ function parsePropertyBag2(bag) {
   }
 
   let attributes = [];
-  let enumerator = bag.enumerator;
+  for (let {name} of bag.enumerator) {
-  while (enumerator.hasMoreElements()) {
-    let name = enumerator.getNext().QueryInterface(Ci.nsIProperty).name;
     let value = bag.getPropertyAsACString(name);
     attributes.push({
       "name": name,

netwerk/dns/mdns/libmdns/fallback/MulticastDNS.jsm

@@ -838,9 +838,7 @@ function _propertyBagToObject(propBag) {
   let result = {};
   if (propBag.QueryInterface) {
     propBag.QueryInterface(Ci.nsIPropertyBag2);
-    let propEnum = propBag.enumerator;
+    for (let prop of propBag.enumerator) {
-    while (propEnum.hasMoreElements()) {
-      let prop = propEnum.getNext().QueryInterface(Ci.nsIProperty);
       result[prop.name] = prop.value.toString();
     }
   } else {

netwerk/test/unit/test_bug411952.js

@@ -8,9 +8,8 @@ function run_test() {
     cm.add("example.com", "/", "C", "V", false, true, false, time, {});
     const now = Math.floor((new Date()).getTime() / 1000);
 
-    var enumerator = cm.enumerator, found = false;
+    var found = false;
-    while (enumerator.hasMoreElements()) {
+    for (let cookie of cm.enumerator) {
-      var cookie = enumerator.getNext().QueryInterface(Ci.nsICookie2);
       if (cookie.host == "example.com" &&
           cookie.path == "/" &&
           cookie.name == "C") {

netwerk/test/unit/test_network_activity.js

@@ -44,10 +44,7 @@ function run_test() {
   // setting up an observer
   let networkActivity = function(subject, topic, value) {
     subject.QueryInterface(Ci.nsIMutableArray);
-    let enumerator = subject.enumerate();
+    for (let data of subject.enumerate()) {
-    while (enumerator.hasMoreElements()) {
-        let data = enumerator.getNext();
-        data.QueryInterface(Ci.nsINetworkActivityData);
         results.push(data);
     }
   };

netwerk/test/unit/test_permmgr.js

@@ -61,13 +61,7 @@ function run_test() {
   }
 
   // test the enumerator ...
-  var j = 0;
+  var perms = Array.from(pm.enumerator);
-  var perms = new Array();
-  var enumerator = pm.enumerator;
-  while (enumerator.hasMoreElements()) {
-    perms[j] = enumerator.getNext().QueryInterface(Ci.nsIPermission);
-    ++j;
-  }
   Assert.equal(perms.length, hosts.length);
 
   // ... remove all the hosts ...

security/manager/pki/resources/content/device_manager.js

@@ -40,9 +40,7 @@ function doConfirm(msg) {
 }
 
 function RefreshDeviceList() {
-  let modules = secmoddb.listModules();
+  for (let module of secmoddb.listModules()) {
-  for (let module of XPCOMUtils.IterSimpleEnumerator(modules,
-                                                     Ci.nsIPKCS11Module)) {
     let slots = module.listSlots();
     AddModule(module, slots);
   }
@@ -81,7 +79,7 @@ function AddModule(module, slots) {
   row.appendChild(cell);
   item.appendChild(row);
   var parent = document.createElement("treechildren");
-  for (let slot of XPCOMUtils.IterSimpleEnumerator(slots, Ci.nsIPKCS11Slot)) {
+  for (let slot of slots) {
     var child_item = document.createElement("treeitem");
     var child_row = document.createElement("treerow");
     var child_cell = document.createElement("treecell");

security/manager/pki/resources/content/pippki.js

@@ -288,13 +288,7 @@ function getChainForUsage(results, usage) {
   for (let result of results) {
     if (certificateUsages[result.usageString] == usage &&
         result.errorCode == PRErrorCodeSuccess) {
-      let array = [];
+      return Array.from(result.chain.getEnumerator());
-      let enumerator = result.chain.getEnumerator();
-      while (enumerator.hasMoreElements()) {
-        let cert = enumerator.getNext().QueryInterface(Ci.nsIX509Cert);
-        array.push(cert);
-      }
-      return array;
     }
   }
   return null;

security/manager/ssl/tests/mochitest/browser/browser_clientAuth_ui.js

@@ -90,9 +90,7 @@ function checkDialogContents(win, notBefore, notAfter) {
 }
 
 function findCertByCommonName(commonName) {
-  let certEnumerator = certDB.getCerts().getEnumerator();
+  for (let cert of certDB.getCerts().getEnumerator()) {
-  while (certEnumerator.hasMoreElements()) {
-    let cert = certEnumerator.getNext().QueryInterface(Ci.nsIX509Cert);
     if (cert.commonName == commonName) {
       return cert;
     }

security/manager/ssl/tests/unit/test_certDB_export_pkcs12.js

@@ -17,9 +17,7 @@ const TEST_CERT_PASSWORD = "黒い";
 const TEST_OUTPUT_PASSWORD = "other password";
 
 function findCertByCommonName(commonName) {
-  let certEnumerator = gCertDB.getCerts().getEnumerator();
+  for (let cert of gCertDB.getCerts().getEnumerator()) {
-  while (certEnumerator.hasMoreElements()) {
-    let cert = certEnumerator.getNext().QueryInterface(Ci.nsIX509Cert);
     if (cert.commonName == commonName) {
       return cert;
     }

security/manager/ssl/tests/unit/test_certDB_export_pkcs12_with_master_password.js

@@ -45,9 +45,7 @@ const gPromptFactory = {
 };
 
 function findCertByCommonName(commonName) {
-  let certEnumerator = gCertDB.getCerts().getEnumerator();
+  for (let cert of gCertDB.getCerts().getEnumerator()) {
-  while (certEnumerator.hasMoreElements()) {
-    let cert = certEnumerator.getNext().QueryInterface(Ci.nsIX509Cert);
     if (cert.commonName == commonName) {
       return cert;
     }

security/manager/ssl/tests/unit/test_certDB_import.js

@@ -65,9 +65,7 @@ function getCertAsByteArray(certPath) {
 }
 
 function commonFindCertBy(propertyName, value) {
-  let certEnumerator = gCertDB.getCerts().getEnumerator();
+  for (let cert of gCertDB.getCerts().getEnumerator()) {
-  while (certEnumerator.hasMoreElements()) {
-    let cert = certEnumerator.getNext().QueryInterface(Ci.nsIX509Cert);
     if (cert[propertyName] == value) {
       return cert;
     }

security/manager/ssl/tests/unit/test_certDB_import_pkcs12.js

@@ -74,9 +74,7 @@ let gTestcases = [
 
 function doesCertExist(commonName) {
   let allCerts = gCertDB.getCerts();
-  let enumerator = allCerts.getEnumerator();
+  for (let cert of allCerts.getEnumerator()) {
-  while (enumerator.hasMoreElements()) {
-    let cert = enumerator.getNext().QueryInterface(Ci.nsIX509Cert);
     if (cert.isBuiltInRoot) {
       continue;
     }

security/manager/ssl/tests/unit/test_certDB_import_with_master_password.js

@@ -82,9 +82,7 @@ function getCertAsByteArray(certPath) {
 }
 
 function findCertByCommonName(commonName) {
-  let certEnumerator = gCertDB.getCerts().getEnumerator();
+  for (let cert of gCertDB.getCerts().getEnumerator()) {
-  while (certEnumerator.hasMoreElements()) {
-    let cert = certEnumerator.getNext().QueryInterface(Ci.nsIX509Cert);
     if (cert.commonName == commonName) {
       return cert;
     }

security/manager/ssl/tests/unit/test_enterprise_roots.js

@@ -31,11 +31,9 @@ function check_no_enterprise_roots_imported(certDB, dbKey = undefined) {
 function check_some_enterprise_roots_imported(certDB) {
   let enterpriseRoots = certDB.getEnterpriseRoots();
   notEqual(enterpriseRoots, null, "should have imported some enterprise roots");
-  let enumerator = enterpriseRoots.getEnumerator();
   let foundNonBuiltIn = false;
   let savedDBKey = null;
-  while (enumerator.hasMoreElements()) {
+  for (let cert of enterpriseRoots.getEnumerator()) {
-    let cert = enumerator.getNext().QueryInterface(Ci.nsIX509Cert);
     if (!cert.isBuiltInRoot && !savedDBKey) {
       foundNonBuiltIn = true;
       savedDBKey = cert.dbKey;

security/manager/ssl/tests/unit/test_pkcs11_module.js

@@ -16,8 +16,7 @@ function checkTestModuleNotPresent() {
   let modules = gModuleDB.listModules();
   ok(modules.hasMoreElements(),
      "One or more modules should be present with test module not present");
-  while (modules.hasMoreElements()) {
+  for (let module of modules) {
-    let module = modules.getNext().QueryInterface(Ci.nsIPKCS11Module);
     notEqual(module.name, "PKCS11 Test Module",
              "Non-test module name shouldn't equal 'PKCS11 Test Module'");
     ok(!(module.libName && module.libName.includes("pkcs11testmodule")),
@@ -37,8 +36,7 @@ function checkTestModuleExists() {
   ok(modules.hasMoreElements(),
      "One or more modules should be present with test module present");
   let testModule = null;
-  while (modules.hasMoreElements()) {
+  for (let module of modules) {
-    let module = modules.getNext().QueryInterface(Ci.nsIPKCS11Module);
     if (module.name == "PKCS11 Test Module") {
       testModule = module;
       break;
@@ -90,12 +88,8 @@ function run_test() {
   let testModule = checkTestModuleExists();
 
   // Check that listing the slots for the test module works.
-  let slots = testModule.listSlots();
+  let testModuleSlotNames = Array.from(testModule.listSlots(),
-  let testModuleSlotNames = [];
+                                       slot => slot.name);
-  while (slots.hasMoreElements()) {
-    let slot = slots.getNext().QueryInterface(Ci.nsIPKCS11Slot);
-    testModuleSlotNames.push(slot.name);
-  }
   testModuleSlotNames.sort();
   const expectedSlotNames = ["Empty PKCS11 Slot", "Test PKCS11 Slot", "Test PKCS11 Slot 二"];
   deepEqual(testModuleSlotNames, expectedSlotNames,

security/manager/ssl/tests/unit/test_pkcs11_moduleDB.js

@@ -30,8 +30,7 @@ function run_test() {
     Services.strings.createBundle("chrome://pipnss/locale/pipnss.properties");
   let rootsModuleName = bundle.GetStringFromName("RootCertModuleName");
   let foundRootsModule = false;
-  for (let module of XPCOMUtils.IterSimpleEnumerator(moduleDB.listModules(),
+  for (let module of moduleDB.listModules()) {
-                                                     Ci.nsIPKCS11Module)) {
     if (module.name == rootsModuleName) {
       foundRootsModule = true;
       break;

security/manager/ssl/tests/unit/test_pkcs11_slot.js

@@ -9,8 +9,7 @@
 do_get_profile();
 
 function find_slot_by_name(module, name) {
-  for (let slot of XPCOMUtils.IterSimpleEnumerator(module.listSlots(),
+  for (let slot of module.listSlots()) {
-                                                   Ci.nsIPKCS11Slot)) {
     if (slot.name == name) {
       return slot;
     }
@@ -19,8 +18,7 @@ function find_slot_by_name(module, name) {
 }
 
 function find_module_by_name(moduleDB, name) {
-  for (let slot of XPCOMUtils.IterSimpleEnumerator(moduleDB.listModules(),
+  for (let slot of moduleDB.listModules()) {
-                                                   Ci.nsIPKCS11Module)) {
     if (slot.name == name) {
       return slot;
     }

security/manager/ssl/tests/unit/test_sss_enumerate.js

@@ -64,13 +64,7 @@ function insertEntries() {
 }
 
 function getEntries(type) {
-  let entryEnumerator = sss.enumerate(type);
+  return Array.from(sss.enumerate(type));
-  let entries = [];
-  while (entryEnumerator.hasMoreElements()) {
-    let entry = entryEnumerator.getNext();
-    entries.push(entry.QueryInterface(Ci.nsISiteSecurityState));
-  }
-  return entries;
 }
 
 function checkSiteSecurityStateAttrs(entries) {
@@ -92,11 +86,9 @@ function checkSiteSecurityStateAttrs(entries) {
 
 function checkSha256Keys(hpkpEntries) {
   for (let hpkpEntry of hpkpEntries) {
-    let enumerator = hpkpEntry.QueryInterface(Ci.nsISiteHPKPState).sha256Keys;
+    let keys = Array.from(hpkpEntry.QueryInterface(Ci.nsISiteHPKPState).sha256Keys,
-    let keys = [];
+                          key => key.QueryInterface(Ci.nsIVariant));
-    while (enumerator.hasMoreElements()) {
+
-      keys.push(enumerator.getNext().QueryInterface(Ci.nsIVariant));
-    }
     equal(keys.length, KEY_HASHES.length, "Should get correct number of keys");
     keys.sort();
     for (let i = 0; i < KEY_HASHES.length; i++) {

security/manager/tools/genHPKPStaticPins.js

@@ -375,11 +375,9 @@ function downloadAndParseChromePins(filename,
 // nicknames and digests of the SPKInfo for the mozilla trust store
 function loadNSSCertinfo(extraCertificates) {
   let allCerts = gCertDB.getCerts();
-  let enumerator = allCerts.getEnumerator();
   let certNameToSKD = {};
   let certSKDToName = {};
-  while (enumerator.hasMoreElements()) {
+  for (let cert of allCerts.getEnumerator()) {
-    let cert = enumerator.getNext().QueryInterface(Ci.nsIX509Cert);
     if (!cert.isBuiltInRoot) {
       continue;
     }

security/manager/tools/genRootCAHashes.js

@@ -172,10 +172,7 @@ function insertTrustAnchorsFromDatabase() {
   const TRUST_TYPE = Ci.nsIX509CertDB.TRUSTED_SSL;
 
   // Iterate through the whole Cert DB
-  let enumerator = CertDb.getCerts().getEnumerator();
+  for (let cert of CertDb.getCerts().getEnumerator()) {
-  while (enumerator.hasMoreElements()) {
-    let cert = enumerator.getNext().QueryInterface(Ci.nsIX509Cert);
-
     // Find the certificate in our existing list. Do it here because we need to check if
     // it's untrusted too.
 

services/common/tests/unit/test_logmanager.js

@@ -227,10 +227,9 @@ add_task(async function test_logFileError() {
 function countLogFiles() {
   let logsdir = FileUtils.getDir("ProfD", ["weave", "logs"], true);
   let count = 0;
-  let entries = logsdir.directoryEntries;
+  for (let entry of logsdir.directoryEntries) {
-  while (entries.hasMoreElements()) {
+    void entry;
     count += 1;
-    entries.getNext();
   }
   return count;
 }

services/sync/modules/engines/tabs.js

@@ -135,9 +135,7 @@ TabStore.prototype = {
 
     let allTabs = [];
 
-    let winEnum = this.getWindowEnumerator();
+    for (let win of this.getWindowEnumerator()) {
-    while (winEnum.hasMoreElements()) {
-      let win = winEnum.getNext();
       if (this.shouldSkipWindow(win)) {
         continue;
       }
@@ -235,9 +233,8 @@ TabStore.prototype = {
     // first syncs.
     let ids = {};
     let allWindowsArePrivate = false;
-    let wins = Services.wm.getEnumerator("navigator:browser");
+    for (let win of Services.wm.getEnumerator("navigator:browser")) {
-    while (wins.hasMoreElements()) {
+      if (PrivateBrowsingUtils.isWindowPrivate(win)) {
-      if (PrivateBrowsingUtils.isWindowPrivate(wins.getNext())) {
         // Ensure that at least there is a private window.
         allWindowsArePrivate = true;
       } else {
@@ -320,17 +317,15 @@ TabTracker.prototype = {
 
   onStart() {
     Svc.Obs.add("domwindowopened", this.asyncObserver);
-    let wins = Services.wm.getEnumerator("navigator:browser");
+    for (let win of Services.wm.getEnumerator("navigator:browser")) {
-    while (wins.hasMoreElements()) {
+      this._registerListenersForWindow(win);
-      this._registerListenersForWindow(wins.getNext());
     }
   },
 
   onStop() {
     Svc.Obs.remove("domwindowopened", this.asyncObserver);
-    let wins = Services.wm.getEnumerator("navigator:browser");
+    for (let win of Services.wm.getEnumerator("navigator:browser")) {
-    while (wins.hasMoreElements()) {
+      this._unregisterListenersForWindow(win);
-      this._unregisterListenersForWindow(wins.getNext());
     }
   },
 

services/sync/tests/unit/head_helpers.js

@@ -241,14 +241,7 @@ function mockGetWindowEnumerator(url, numWindows, numTabs, indexes, moreURLs) {
     },
   });
 
-  return {
+  return elements.values();
-    hasMoreElements() {
-      return elements.length;
-    },
-    getNext() {
-      return elements.shift();
-    },
-  };
 }
 
 // Helper function to get the sync telemetry and add the typically used test

services/sync/tests/unit/test_tab_tracker.js

@@ -16,14 +16,8 @@ function fakeSvcWinMediator() {
   // actions on windows are captured in logs
   let logs = [];
   delete Services.wm;
-  Services.wm = {
+
-    getEnumerator() {
+  function getNext() {
-      return {
-        cnt: 2,
-        hasMoreElements() {
-          return this.cnt-- > 0;
-        },
-        getNext() {
     let elt = {addTopics: [], remTopics: [], numAPL: 0, numRPL: 0};
     logs.push(elt);
     return {
@@ -43,7 +37,10 @@ function fakeSvcWinMediator() {
       },
     };
   }
-      };
+
+  Services.wm = {
+    getEnumerator() {
+      return [getNext(), getNext()];
     }
   };
   return logs;

storage/test/unit/test_vacuum.js

@@ -23,9 +23,7 @@ function load_test_vacuum_component() {
   let catMan = Cc["@mozilla.org/categorymanager;1"].
                getService(Ci.nsICategoryManager);
   let found = false;
-  let entries = catMan.enumerateCategory(CATEGORY_NAME);
+  for (let {data: entry} of catMan.enumerateCategory(CATEGORY_NAME)) {
-  while (entries.hasMoreElements()) {
-    let entry = entries.getNext().QueryInterface(Ci.nsISupportsCString).data;
     print("Check if the found category entry (" + entry + ") is expected.");
     if (EXPECTED_ENTRIES.includes(entry)) {
       print("Check that only one test entry exists.");

taskcluster/docker/periodic-updates/scripts/genHPKPStaticPins.js

@@ -370,11 +370,9 @@ function downloadAndParseChromePins(filename,
 // nicknames and digests of the SPKInfo for the mozilla trust store
 function loadNSSCertinfo(extraCertificates) {
   let allCerts = gCertDB.getCerts();
-  let enumerator = allCerts.getEnumerator();
   let certNameToSKD = {};
   let certSKDToName = {};
-  while (enumerator.hasMoreElements()) {
+  for (let cert of allCerts.getEnumerator()) {
-    let cert = enumerator.getNext().QueryInterface(Ci.nsIX509Cert);
     if (!cert.isBuiltInRoot) {
       continue;
     }

testing/marionette/components/marionette.js

@@ -383,9 +383,7 @@ class MarionetteParentProcess {
         // When Firefox starts on Windows, an additional GFX sanity test
         // window may appear off-screen.  Marionette should wait for it
         // to close.
-        let winEn = Services.wm.getEnumerator(null);
+        for (let win of Services.wm.getEnumerator(null)) {
-        while (winEn.hasMoreElements()) {
-          let win = winEn.getNext();
           if (win.document.documentURI == "chrome://gfxsanity/content/sanityparent.html") {
             this.gfxWindow = win;
             break;

testing/marionette/cookie.js

@@ -209,9 +209,8 @@ cookie.iter = function* (host, currentPath = "/") {
 
   const isForCurrentPath = path => currentPath.includes(path);
 
-  let en = cookie.manager.getCookiesFromHost(host, {});
+  let cookies = cookie.manager.getCookiesFromHost(host, {});
-  while (en.hasMoreElements()) {
+  for (let cookie of cookies) {
-    let cookie = en.getNext().QueryInterface(Ci.nsICookie2);
     // take the hostname and progressively shorten
     let hostname = host;
     do {

testing/marionette/driver.js

@@ -92,24 +92,6 @@ const globalMessageManager = Services.mm;
  * @namespace driver
  */
 
-/**
- * Helper function for converting a {@link nsISimpleEnumerator} to a
- * JavaScript iterator.
- *
- * @memberof driver
- *
- * @param {nsISimpleEnumerator} enumerator
- *     Enumerator to turn into  iterator.
- *
- * @return {Iterable}
- *     Iterator.
- */
-function* enumeratorIterator(enumerator) {
-  while (enumerator.hasMoreElements()) {
-    yield enumerator.getNext();
-  }
-}
-
 /**
  * Implements (parts of) the W3C WebDriver protocol.  GeckoDriver lives
  * in chrome space and mediates calls to the message listener of the current
@@ -243,7 +225,7 @@ Object.defineProperty(GeckoDriver.prototype, "timeouts", {
 
 Object.defineProperty(GeckoDriver.prototype, "windows", {
   get() {
-    return enumeratorIterator(Services.wm.getEnumerator(null));
+    return Services.wm.getEnumerator(null);
   },
 });
 

testing/marionette/modal.js

@@ -62,10 +62,7 @@ modal.addHandler = function(handler) {
 modal.findModalDialogs = function(context) {
   // First check if there is a modal dialog already present for the
   // current browser window.
-  let winEn = Services.wm.getEnumerator(null);
+  for (let win of Services.wm.getEnumerator(null)) {
-  while (winEn.hasMoreElements()) {
-    let win = winEn.getNext();
-
     // Modal dialogs which do not have an opener set, we cannot detect
     // as long as GetZOrderDOMWindowEnumerator doesn't work on Linux
     // (Bug 156333).

testing/marionette/test/unit/test_cookie.js

@@ -42,21 +42,8 @@ cookie.manager = {
   getCookiesFromHost(host) {
     let hostCookies = this.cookies.filter(c => c.host === host ||
        c.host === "." + host);
-    let nextIndex = 0;
 
-    return {
+    return hostCookies;
-      hasMoreElements() {
-        return nextIndex < hostCookies.length;
-      },
-
-      getNext() {
-        return {
-          QueryInterface() {
-            return hostCookies[nextIndex++];
-          },
-        };
-      },
-    };
   },
 };
 

testing/mochitest/api.js

@@ -129,9 +129,7 @@ this.mochikit = class extends ExtensionAPI {
 
   onShutdown() {
     if (AppConstants.platform != "android") {
-      let windows = Services.wm.getEnumerator("navigator:browser");
+      for (let win of Services.wm.getEnumerator("navigator:browser")) {
-      while (windows.hasMoreElements()) {
-        let win = windows.getNext().QueryInterface(Ci.nsIDOMWindow);
         WindowListener.tearDownWindow(win);
       }
 

testing/mochitest/browser-test.js

@@ -537,9 +537,7 @@ Tester.prototype = {
   },
 
   waitForGraphicsTestWindowToBeGone(aCallback) {
-    let windowsEnum = Services.wm.getEnumerator(null);
+    for (let win of Services.wm.getEnumerator(null)) {
-    while (windowsEnum.hasMoreElements()) {
-      let win = windowsEnum.getNext();
       if (win != window && !win.closed &&
           win.document.documentURI == "chrome://gfxsanity/content/sanityparent.html") {
         this.BrowserTestUtils.domWindowClosed(win).then(aCallback);
@@ -586,9 +584,7 @@ Tester.prototype = {
 
     // Remove stale windows
     this.structuredLogger.info("checking window state");
-    let windowsEnum = Services.wm.getEnumerator(null);
+    for (let win of Services.wm.getEnumerator(null)) {
-    while (windowsEnum.hasMoreElements()) {
-      let win = windowsEnum.getNext();
       if (win != window && !win.closed &&
           win.document.documentElement.getAttribute("id") != "browserTestHarness") {
         let type = win.document.documentElement.getAttribute("windowtype");

testing/specialpowers/content/SpecialPowersObserverAPI.js

@@ -262,13 +262,10 @@ SpecialPowersObserverAPI.prototype = {
     // First create observers from the category manager.
     let cm =
       Cc["@mozilla.org/categorymanager;1"].getService(Ci.nsICategoryManager);
-    let enumerator = cm.enumerateCategory(topic);
 
     let observers = [];
 
-    while (enumerator.hasMoreElements()) {
+    for (let {data: entry} of cm.enumerateCategory(topic)) {
-      let entry =
-        enumerator.getNext().QueryInterface(Ci.nsISupportsCString).data;
       let contractID = cm.getCategoryEntry(topic, entry);
 
       let factoryFunction;
@@ -289,14 +286,11 @@ SpecialPowersObserverAPI.prototype = {
     }
 
     // Next enumerate the registered observers.
-    enumerator = Services.obs.enumerateObservers(topic);
+    for (let observer of Services.obs.enumerateObservers(topic)) {
-    while (enumerator.hasMoreElements()) {
+      if (observer instanceof Ci.nsIObserver &&
-      try {
+          !observers.includes(observer)) {
-        let observer = enumerator.getNext().QueryInterface(Ci.nsIObserver);
-        if (!observers.includes(observer)) {
         observers.push(observer);
       }
-      } catch (e) { }
     }
 
     observers.forEach(function(observer) {

testing/talos/talos/talos-powers/bootstrap.js

@@ -245,9 +245,7 @@ TalosPowersService.prototype = {
       });
     }
 
-    let enumerator = Services.wm.getEnumerator(null);
+    for (let domWindow of Services.wm.getEnumerator(null)) {
-    while (enumerator.hasMoreElements()) {
-      let domWindow = enumerator.getNext();
       domWindow.close();
     }
 

uriloader/exthandler/HandlerService.js

@@ -252,9 +252,7 @@ HandlerService.prototype = {
     if (handlerInfo.preferredApplicationHandler) {
       handlers.push(handlerInfo.preferredApplicationHandler);
     }
-    let enumerator = handlerInfo.possibleApplicationHandlers.enumerate();
+    for (let handler of handlerInfo.possibleApplicationHandlers.enumerate(Ci.nsIHandlerApp)) {
-    while (enumerator.hasMoreElements()) {
-      let handler = enumerator.getNext().QueryInterface(Ci.nsIHandlerApp);
       // If the caller stored duplicate handlers, we save them only once.
       if (!handlers.some(h => h.equals(handler))) {
         handlers.push(handler);

uriloader/exthandler/tests/HandlerServiceTestUtils.jsm

@@ -35,14 +35,9 @@ var HandlerServiceTestUtils = {
    *         alphabetically regardless of category.
    */
   getAllHandlerInfoTypes() {
-    let handlerInfoTypes = [];
+    return Array.from(gHandlerService.enumerate(),
-    let handlerInfoEnumerator = gHandlerService.enumerate();
+                      info => info.type)
-    while (handlerInfoEnumerator.hasMoreElements()) {
+                .sort();
-      let handlerInfo = handlerInfoEnumerator.getNext()
-                                             .QueryInterface(Ci.nsIHandlerInfo);
-      handlerInfoTypes.push(handlerInfo.type);
-    }
-    return handlerInfoTypes.sort();
   },
 
   /**

uriloader/exthandler/tests/mochitest/browser_remember_download_option.js

@@ -29,9 +29,7 @@ add_task(async function() {
   // check the extension.
   var mimeType = gHandlerSvc.getTypeFromExtension("abc");
   is(mimeType, launcher.MIMEInfo.type, "Got correct mime type.");
-  var handlerInfos = gHandlerSvc.enumerate();
+  for (let handlerInfo of gHandlerSvc.enumerate()) {
-  while (handlerInfos.hasMoreElements()) {
-    let handlerInfo = handlerInfos.getNext().QueryInterface(Ci.nsIHandlerInfo);
     if (handlerInfo.type == launcher.MIMEInfo.type) {
       // check the alwaysAskBeforeHandling
       ok(!handlerInfo.alwaysAskBeforeHandling,

uriloader/exthandler/tests/unit/test_handlerService.js

@@ -240,9 +240,7 @@ function run_test() {
     handlerTypes.push("irc");
     handlerTypes.push("ircs");
   }
-  var handlers = handlerSvc.enumerate();
+  for (let handler of handlerSvc.enumerate()) {
-  while (handlers.hasMoreElements()) {
-    var handler = handlers.getNext().QueryInterface(Ci.nsIHandlerInfo);
     Assert.notEqual(handlerTypes.indexOf(handler.type), -1);
     handlerTypes.splice(handlerTypes.indexOf(handler.type), 1);
   }

xpcom/tests/unit/test_nsIMutableArray.js

@@ -84,10 +84,8 @@ function test_clear() {
 function test_enumerate() {
   var arr = create_n_element_array(5);
   Assert.equal(5, arr.length);
-  var en = arr.enumerate();
   var i = 0;
-  while (en.hasMoreElements()) {
+  for (let str of arr.enumerate()) {
-    let str = en.getNext();
     Assert.ok(str instanceof Ci.nsISupportsString);
     Assert.equal(str.data, "element " + i);
     i++;