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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /js/src/tests/non262/Array/from_iterable.js | |
parent | Initial commit. (diff) | |
download | firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip |
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | js/src/tests/non262/Array/from_iterable.js | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/js/src/tests/non262/Array/from_iterable.js b/js/src/tests/non262/Array/from_iterable.js new file mode 100644 index 0000000000..5681819612 --- /dev/null +++ b/js/src/tests/non262/Array/from_iterable.js @@ -0,0 +1,50 @@ +/* Any copyright is dedicated to the Public Domain. + * http://creativecommons.org/licenses/publicdomain/ */ + +// Array.from works on arguments objects. +(function () { + assertDeepEq(Array.from(arguments), ["arg0", "arg1", undefined]); +})("arg0", "arg1", undefined); + +// If an object has both .length and [@@iterator] properties, [@@iterator] is used. +var a = ['a', 'e', 'i', 'o', 'u']; +a[Symbol.iterator] = function* () { + for (var i = 5; i--; ) + yield this[i]; +}; + +var log = ''; +function f(x) { + log += x; + return x + x; +} + +var b = Array.from(a, f); +assertDeepEq(b, ['uu', 'oo', 'ii', 'ee', 'aa']); +assertEq(log, 'uoiea'); + +// In fact, if [@@iterator] is present, .length isn't queried at all. +var pa = new Proxy(a, { + has: function (target, id) { + if (id === "length") + throw new Error(".length should not be queried (has)"); + return id in target; + }, + get: function (target, id) { + if (id === "length") + throw new Error(".length should not be queried (get)"); + return target[id]; + }, + getOwnPropertyDescriptor: function (target, id) { + if (id === "length") + throw new Error(".length should not be queried (getOwnPropertyDescriptor)"); + return Object.getOwnPropertyDescriptor(target, id) + } +}); +log = ""; +b = Array.from(pa, f); +assertDeepEq(b, ['uu', 'oo', 'ii', 'ee', 'aa']); +assertEq(log, 'uoiea'); + +if (typeof reportCompare === 'function') + reportCompare(0, 0); |