'use strict'; var GetIntrinsic = require('get-intrinsic'); var $ArrayPrototype = GetIntrinsic('%Array.prototype%'); var $RangeError = require('es-errors/range'); var $SyntaxError = require('es-errors/syntax'); var $TypeError = require('es-errors/type'); var isInteger = require('../helpers/isInteger'); var MAX_ARRAY_LENGTH = Math.pow(2, 32) - 1; var hasProto = require('has-proto')(); var $setProto = GetIntrinsic('%Object.setPrototypeOf%', true) || ( hasProto ? function (O, proto) { O.__proto__ = proto; // eslint-disable-line no-proto, no-param-reassign return O; } : null ); // https://262.ecma-international.org/12.0/#sec-arraycreate module.exports = function ArrayCreate(length) { if (!isInteger(length) || length < 0) { throw new $TypeError('Assertion failed: `length` must be an integer Number >= 0'); } if (length > MAX_ARRAY_LENGTH) { throw new $RangeError('length is greater than (2**32 - 1)'); } var proto = arguments.length > 1 ? arguments[1] : $ArrayPrototype; var A = []; // steps 3, 5 if (proto !== $ArrayPrototype) { // step 4 if (!$setProto) { throw new $SyntaxError('ArrayCreate: a `proto` argument that is not `Array.prototype` is not supported in an environment that does not support setting the [[Prototype]]'); } $setProto(A, proto); } if (length !== 0) { // bypasses the need for step 6 A.length = length; } /* step 6, the above as a shortcut for the below OrdinaryDefineOwnProperty(A, 'length', { '[[Configurable]]': false, '[[Enumerable]]': false, '[[Value]]': length, '[[Writable]]': true }); */ return A; };