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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
commit36d22d82aa202bb199967e9512281e9a53db42c9 (patch)
tree105e8c98ddea1c1e4784a60a5a6410fa416be2de /js/src/tests/non262/Array/from_iterable.js
parentInitial commit. (diff)
downloadfirefox-esr-upstream.tar.xz
firefox-esr-upstream.zip
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'js/src/tests/non262/Array/from_iterable.js')
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diff --git a/js/src/tests/non262/Array/from_iterable.js b/js/src/tests/non262/Array/from_iterable.js
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+++ b/js/src/tests/non262/Array/from_iterable.js
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+/* 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);