from_entries.js (1468B)
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 isArrayArray = require( '@stdlib/assert/is-array-array' ); 24 25 26 // MAIN // 27 28 /** 29 * Creates an object from an array of key-value pairs. 30 * 31 * @param {ArrayArray} entries - input object 32 * @throws {TypeError} must provide an array of arrays 33 * @returns {Object} object created from `[key, value]` pairs 34 * 35 * @example 36 * var entries = [ ['beep', 'boop'], ['foo', 'bar'] ]; 37 * 38 * var obj = objectFromEntries( entries ); 39 * // returns {'beep': 'boop', 'foo': 'bar'} 40 */ 41 function objectFromEntries( entries ) { 42 var out; 43 var i; 44 if ( !isArrayArray( entries ) ) { 45 throw new TypeError( 'invalid argument. Must provide an array of arrays. Value: `'+entries+'`.' ); 46 } 47 out = {}; 48 for ( i = 0; i < entries.length; i++ ) { 49 out[ entries[i][0] ] = entries[ i ][ 1 ]; 50 } 51 return out; 52 } 53 54 55 // EXPORTS // 56 57 module.exports = objectFromEntries;