[d565449] | 1 | 'use strict';
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| 2 |
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| 3 | var GetIntrinsic = require('get-intrinsic');
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| 4 |
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| 5 | var $ArrayPrototype = GetIntrinsic('%Array.prototype%');
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| 6 | var $RangeError = require('es-errors/range');
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| 7 | var $SyntaxError = require('es-errors/syntax');
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| 8 | var $TypeError = require('es-errors/type');
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| 9 |
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| 10 | var isInteger = require('../helpers/isInteger');
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| 11 |
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| 12 | var MAX_ARRAY_LENGTH = Math.pow(2, 32) - 1;
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| 13 |
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| 14 | var hasProto = require('has-proto')();
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| 15 |
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| 16 | var $setProto = GetIntrinsic('%Object.setPrototypeOf%', true) || (
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| 17 | hasProto
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| 18 | ? function (O, proto) {
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| 19 | O.__proto__ = proto; // eslint-disable-line no-proto, no-param-reassign
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| 20 | return O;
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| 21 | }
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| 22 | : null
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| 23 | );
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| 24 |
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| 25 | // https://262.ecma-international.org/12.0/#sec-arraycreate
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| 26 |
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| 27 | module.exports = function ArrayCreate(length) {
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| 28 | if (!isInteger(length) || length < 0) {
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| 29 | throw new $TypeError('Assertion failed: `length` must be an integer Number >= 0');
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| 30 | }
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| 31 | if (length > MAX_ARRAY_LENGTH) {
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| 32 | throw new $RangeError('length is greater than (2**32 - 1)');
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| 33 | }
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| 34 | var proto = arguments.length > 1 ? arguments[1] : $ArrayPrototype;
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| 35 | var A = []; // steps 3, 5
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| 36 | if (proto !== $ArrayPrototype) { // step 4
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| 37 | if (!$setProto) {
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| 38 | 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]]');
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| 39 | }
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| 40 | $setProto(A, proto);
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| 41 | }
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| 42 | if (length !== 0) { // bypasses the need for step 6
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| 43 | A.length = length;
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| 44 | }
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| 45 | /* step 6, the above as a shortcut for the below
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| 46 | OrdinaryDefineOwnProperty(A, 'length', {
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| 47 | '[[Configurable]]': false,
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| 48 | '[[Enumerable]]': false,
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| 49 | '[[Value]]': length,
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| 50 | '[[Writable]]': true
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| 51 | });
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| 52 | */
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| 53 | return A;
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| 54 | };
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