dget.js (1273B)
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 isObjectLike = require( '@stdlib/assert/is-object-like' ); 24 var hasOwnProp = require( '@stdlib/assert/has-own-property' ); 25 26 27 // MAIN // 28 29 /** 30 * Returns a nested property value. 31 * 32 * @private 33 * @param {ObjectLike} obj - input object 34 * @param {Array} props - list of properties defining a key path 35 * @returns {*} nested property value 36 */ 37 function deepGet( obj, props ) { 38 var len = props.length; 39 var v = obj; 40 var i; 41 for ( i = 0; i < len; i++ ) { 42 if ( 43 isObjectLike( v ) && 44 hasOwnProp( v, props[ i ] ) 45 ) { 46 v = v[ props[ i ] ]; 47 } else { 48 return; 49 } 50 } 51 return v; 52 } 53 54 55 // EXPORTS // 56 57 module.exports = deepGet;