// Copyright 2020 the V8 project authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. namespace array { // https://tc39.es/proposal-item-method/#sec-array.prototype.at transitioning javascript builtin ArrayPrototypeAt( js-implicit context: NativeContext, receiver: JSAny)(index: JSAny): JSAny { // 1. Let O be ? ToObject(this value). const o = ToObject_Inline(context, receiver); // 2. Let len be ? LengthOfArrayLike(O). const len = GetLengthProperty(o); // 3. Let relativeIndex be ? ToInteger(index). const relativeIndex = ToInteger_Inline(index); // 4. If relativeIndex ≥ 0, then // a. Let k be relativeIndex. // 5. Else, // a. Let k be len + relativeIndex. const k = relativeIndex >= 0 ? relativeIndex : len + relativeIndex; // 6. If k < 0 or k ≥ len, then return undefined. if (k < 0 || k >= len) { return Undefined; } // 7. Return ? Get(O, ! ToString(k)). return GetProperty(o, k); } }