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LibJS: Implement Array.prototype.entries

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davidot 2021-06-13 17:54:24 +02:00 • committed by Linus Groh
parent 910b803d8d
commit 417f752306
3 changed files with 56 additions and 0 deletions
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44
Userland/Libraries/LibJS/Tests/builtins/Array/Array.prototype.entries.js Normal file
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test("length", () => {
expect(Array.prototype.entries.length).toBe(0);
});
test("basic functionality", () => {
const a = ["a", "b", "c"];
const it = a.entries();
expect(it.next()).toEqual({ value: [0, "a"], done: false });
expect(it.next()).toEqual({ value: [1, "b"], done: false });
expect(it.next()).toEqual({ value: [2, "c"], done: false });
expect(it.next()).toEqual({ value: undefined, done: true });
expect(it.next()).toEqual({ value: undefined, done: true });
expect(it.next()).toEqual({ value: undefined, done: true });
});
test("works when applied to non-object", () => {
[true, false, 9, 2n, Symbol()].forEach(primitive => {
const it = [].entries.call(primitive);
expect(it.next()).toEqual({ value: undefined, done: true });
expect(it.next()).toEqual({ value: undefined, done: true });
expect(it.next()).toEqual({ value: undefined, done: true });
});
});
test("item added to array before exhaustion is accessible", () => {
const a = ["a", "b"];
const it = a.entries();
expect(it.next()).toEqual({ value: [0, "a"], done: false });
expect(it.next()).toEqual({ value: [1, "b"], done: false });
a.push("c");
expect(it.next()).toEqual({ value: [2, "c"], done: false });
expect(it.next()).toEqual({ value: undefined, done: true });
expect(it.next()).toEqual({ value: undefined, done: true });
});
test("item added to array after exhaustion is inaccessible", () => {
const a = ["a", "b"];
const it = a.entries();
expect(it.next()).toEqual({ value: [0, "a"], done: false });
expect(it.next()).toEqual({ value: [1, "b"], done: false });
expect(it.next()).toEqual({ value: undefined, done: true });
a.push("c");
expect(it.next()).toEqual({ value: undefined, done: true });
});