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LibJS: Make Array.prototype.concat generic

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davidot 2021-06-13 15:13:43 +02:00 • committed by Linus Groh
parent 2ef9df989f
commit 4152409ac5
2 changed files with 109 additions and 10 deletions
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39
Userland/Libraries/LibJS/Tests/builtins/Array/Array.prototype-generic-functions.js
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@ -203,4 +203,43 @@ describe("ability to work with generic non-array objects", () => {
0: "foo",
});
});
test("concat", () => {
expect(Array.prototype.concat.call(o)).toEqual([o]);
expect(Array.prototype.concat.call(o, true)).toEqual([o, true]);
expect(Array.prototype.concat.call({}, o)).toEqual([{}, o]);
const spreadable = {
length: 5,
0: "foo",
1: "bar",
3: "baz",
[Symbol.isConcatSpreadable]: true,
};
expect(Array.prototype.concat.call(spreadable)).toEqual([
"foo",
"bar",
undefined,
"baz",
undefined,
]);
expect(Array.prototype.concat.call(spreadable, [1, 2])).toEqual([
"foo",
"bar",
undefined,
"baz",
undefined,
1,
2,
]);
expect(Array.prototype.concat.call([1], spreadable, [2])).toEqual([
1,
"foo",
"bar",
undefined,
"baz",
undefined,
2,
]);
});
});