reviver.js (1363B)
1 /** 2 * @license Apache-2.0 3 * 4 * Copyright (c) 2018 The Stdlib Authors. 5 * 6 * Licensed under the Apache License, Version 2.0 (the "License"); 7 * you may not use this file except in compliance with the License. 8 * You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 'use strict'; 20 21 // MODULES // 22 23 var isArray = require( '@stdlib/assert/is-array' ); 24 var ctors = require( './ctors.js' ); 25 26 27 // MAIN // 28 29 /** 30 * Revives a JSON-serialized typed array. 31 * 32 * @param {string} key - key 33 * @param {*} value - value 34 * @returns {(*|TypedArray)} value or typed array 35 * 36 * @example 37 * var parseJSON = require( '@stdlib/utils/parse-json' ); 38 * 39 * var str = '{"type":"Float64Array","data":[5,3]}'; 40 * 41 * var arr = parseJSON( str, reviver ); 42 * // returns <Float64Array>[ 5.0, 3.0 ] 43 */ 44 function reviver( key, value ) { 45 var ctor; 46 if ( 47 value && 48 value.type && 49 isArray( value.data ) 50 ) { 51 ctor = ctors[ value.type ]; 52 if ( ctor ) { 53 return new ctor( value.data ); 54 } 55 } 56 return value; 57 } 58 59 60 // EXPORTS // 61 62 module.exports = reviver;