48 lines
1.6 KiB
JavaScript
48 lines
1.6 KiB
JavaScript
'use strict';
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var $SyntaxError = require('es-errors/syntax');
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var $TypeError = require('es-errors/type');
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var IsArray = require('./IsArray');
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var IsConstructor = require('./IsConstructor');
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var ValidateTypedArray = require('./ValidateTypedArray');
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var availableTypedArrays = require('available-typed-arrays')();
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var typedArrayLength = require('typed-array-length');
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// https://262.ecma-international.org/7.0/#typedarray-create
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module.exports = function TypedArrayCreate(constructor, argumentList) {
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if (!IsConstructor(constructor)) {
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throw new $TypeError('Assertion failed: `constructor` must be a constructor');
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}
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if (!IsArray(argumentList)) {
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throw new $TypeError('Assertion failed: `argumentList` must be a List');
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}
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if (availableTypedArrays.length === 0) {
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throw new $SyntaxError('Assertion failed: Typed Arrays are not supported in this environment');
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}
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// var newTypedArray = Construct(constructor, argumentList); // step 1
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var newTypedArray;
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if (argumentList.length === 0) {
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newTypedArray = new constructor();
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} else if (argumentList.length === 1) {
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newTypedArray = new constructor(argumentList[0]);
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} else if (argumentList.length === 2) {
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newTypedArray = new constructor(argumentList[0], argumentList[1]);
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} else {
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newTypedArray = new constructor(argumentList[0], argumentList[1], argumentList[2]);
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}
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ValidateTypedArray(newTypedArray); // step 2
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if (argumentList.length === 1 && typeof argumentList[0] === 'number') { // step 3
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if (typedArrayLength(newTypedArray) < argumentList[0]) {
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throw new $TypeError('Assertion failed: `argumentList[0]` must be <= `newTypedArray.length`'); // step 3.a
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}
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}
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return newTypedArray; // step 4
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};
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