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Automatic update from web-platform-tests
Update URLs to Web IDL
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interfaces/WebIDL.idl will be updated when webref is updated next time,
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40 lines
1.3 KiB
HTML
40 lines
1.3 KiB
HTML
<!doctype html>
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<meta charset="utf-8">
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<title>Behavior of iterators when modified within foreach</title>
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<link rel="help" href="https://webidl.spec.whatwg.org/#es-forEach">
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<link rel="author" title="Manish Goregaokar" href="mailto:manishsmail@gmail.com">
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<script>
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test(function() {
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let params = new URLSearchParams("a=1&b=2&c=3");
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let arr = [];
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params.forEach((p) => {
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arr.push(p);
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params.delete("b");
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})
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assert_array_equals(arr, ["1", "3"]);
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}, "forEach will not iterate over elements removed during iteration");
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test(function() {
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let params = new URLSearchParams("a=1&b=2&c=3&d=4");
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let arr = [];
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params.forEach((p) => {
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arr.push(p);
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if (p == "2") {
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params.delete("a");
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}
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})
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assert_array_equals(arr, ["1", "2", "4"]);
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}, "Removing elements already iterated over during forEach will cause iterator to skip an element");
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test(function() {
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let params = new URLSearchParams("a=1&b=2&c=3&d=4");
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let arr = [];
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params.forEach((p) => {
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arr.push(p);
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if (p == "2") {
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params.append("e", "5");
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}
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})
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assert_array_equals(arr, ["1", "2", "3", "4", "5"]);
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}, "Elements added during iteration with forEach will be reached");
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</script>
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