README.md (2890B)
1 <!-- 2 3 @license Apache-2.0 4 5 Copyright (c) 2018 The Stdlib Authors. 6 7 Licensed under the Apache License, Version 2.0 (the "License"); 8 you may not use this file except in compliance with the License. 9 You may obtain a copy of the License at 10 11 http://www.apache.org/licenses/LICENSE-2.0 12 13 Unless required by applicable law or agreed to in writing, software 14 distributed under the License is distributed on an "AS IS" BASIS, 15 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 16 See the License for the specific language governing permissions and 17 limitations under the License. 18 19 --> 20 21 # inheritedProperties 22 23 > Return an array of an object's inherited property names and [symbols][@stdlib/symbol/ctor]. 24 25 <section class="usage"> 26 27 ## Usage 28 29 ```javascript 30 var inheritedProperties = require( '@stdlib/utils/inherited-properties' ); 31 ``` 32 33 #### inheritedProperties( obj\[, level] ) 34 35 Returns an `array` of an object's inherited property names and [symbols][@stdlib/symbol/ctor]. 36 37 ```javascript 38 var props = inheritedProperties( [ 1, 2, 3 ] ); 39 // returns [...] 40 ``` 41 42 By default, the function walks an object's entire prototype chain. To limit the inheritance level, provide a `level` argument. 43 44 ```javascript 45 var props = inheritedProperties( [ 1, 2, 3 ], 1 ); 46 ``` 47 48 </section> 49 50 <!-- /.usage --> 51 52 <section class="notes"> 53 54 </section> 55 56 <!-- /.notes --> 57 58 <section class="examples"> 59 60 ## Examples 61 62 <!-- eslint no-undef: "error" --> 63 64 ```javascript 65 var hasSymbolSupport = require( '@stdlib/assert/has-symbol-support' ); 66 var Symbol = require( '@stdlib/symbol/ctor' ); 67 var defineProperty = require( '@stdlib/utils/define-property' ); 68 var inheritedProperties = require( '@stdlib/utils/inherited-properties' ); 69 70 var hasSymbols; 71 var props; 72 var obj; 73 74 hasSymbols = hasSymbolSupport(); 75 76 function Foo() { 77 this.a = 'b'; 78 defineProperty( this, 'foo', { 79 'configurable': false, 80 'enumerable': false, 81 'writable': false, 82 'value': 'bar' 83 }); 84 if ( hasSymbols ) { 85 this[ Symbol( 'a' ) ] = 'b'; 86 defineProperty( this, 'beep', { 87 'configurable': false, 88 'enumerable': false, 89 'writable': false, 90 'value': 'boop' 91 }); 92 } 93 return this; 94 } 95 96 Foo.prototype.c = 'd'; 97 defineProperty( Foo.prototype, 'bip', { 98 'configurable': false, 99 'enumerable': false, 100 'writable': false, 101 'value': 'bap' 102 }); 103 if ( hasSymbols ) { 104 Foo.prototype[ Symbol( 'c' ) ] = 'd'; 105 defineProperty( Foo.prototype, Symbol( 'e' ), { 106 'configurable': false, 107 'enumerable': false, 108 'writable': false, 109 'value': 'f' 110 }); 111 } 112 113 obj = new Foo(); 114 props = inheritedProperties( obj ); 115 116 console.log( props ); 117 // => [ ..., 'c', 'bip', ... ] 118 ``` 119 120 </section> 121 122 <!-- /.examples --> 123 124 <section class="links"> 125 126 [@stdlib/symbol/ctor]: https://www.npmjs.com/package/@stdlib/symbol-ctor 127 128 </section> 129 130 <!-- /.links -->