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LibJS: Add Array.prototype.keys()
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3 changed files with 56 additions and 0 deletions
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@ -62,6 +62,7 @@ void ArrayPrototype::initialize(GlobalObject& global_object)
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define_native_function(vm.names.values, values, 0, attr);
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define_native_function(vm.names.flat, flat, 0, attr);
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define_native_function(vm.names.at, at, 1, attr);
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define_native_function(vm.names.keys, keys, 0, attr);
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// Use define_property here instead of define_native_function so that
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// Object.is(Array.prototype[Symbol.iterator], Array.prototype.values)
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@ -1033,6 +1034,16 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::values)
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return ArrayIterator::create(global_object, this_object, Object::PropertyKind::Value);
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}
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// 23.1.3.16 Array.prototype.keys ( ), https://tc39.es/ecma262/#sec-array.prototype.keys
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JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::keys)
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{
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auto* this_object = vm.this_value(global_object).to_object(global_object);
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if (!this_object)
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return {};
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return ArrayIterator::create(global_object, this_object, Object::PropertyKind::Key);
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}
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static void recursive_array_flat(VM& vm, GlobalObject& global_object, Array& new_array, Object& array, double depth)
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{
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auto array_length = length_of_array_like(global_object, array);
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@ -48,6 +48,7 @@ private:
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JS_DECLARE_NATIVE_FUNCTION(values);
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JS_DECLARE_NATIVE_FUNCTION(flat);
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JS_DECLARE_NATIVE_FUNCTION(at);
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JS_DECLARE_NATIVE_FUNCTION(keys);
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};
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}
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@ -0,0 +1,44 @@
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test("length", () => {
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expect(Array.prototype.keys.length).toBe(0);
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});
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test("basic functionality", () => {
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const a = ["a", "b", "c"];
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const it = a.keys();
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expect(it.next()).toEqual({ value: 0, done: false });
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expect(it.next()).toEqual({ value: 1, done: false });
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expect(it.next()).toEqual({ value: 2, done: false });
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expect(it.next()).toEqual({ value: undefined, done: true });
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expect(it.next()).toEqual({ value: undefined, done: true });
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expect(it.next()).toEqual({ value: undefined, done: true });
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});
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test("works when applied to non-object", () => {
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[true, false, 9, 2n, Symbol()].forEach(primitive => {
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const it = [].keys.call(primitive);
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expect(it.next()).toEqual({ value: undefined, done: true });
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expect(it.next()).toEqual({ value: undefined, done: true });
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expect(it.next()).toEqual({ value: undefined, done: true });
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});
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});
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test("item added to array before exhaustion is accessible", () => {
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const a = ["a", "b"];
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const it = a.keys();
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expect(it.next()).toEqual({ value: 0, done: false });
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expect(it.next()).toEqual({ value: 1, done: false });
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a.push("c");
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expect(it.next()).toEqual({ value: 2, done: false });
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expect(it.next()).toEqual({ value: undefined, done: true });
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expect(it.next()).toEqual({ value: undefined, done: true });
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});
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test("item added to array after exhaustion is inaccessible", () => {
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const a = ["a", "b"];
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const it = a.keys();
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expect(it.next()).toEqual({ value: 0, done: false });
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expect(it.next()).toEqual({ value: 1, done: false });
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expect(it.next()).toEqual({ value: undefined, done: true });
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a.push("c");
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expect(it.next()).toEqual({ value: undefined, done: true });
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});
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