time-to-botec

Benchmark sampling in different programming languages
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README.md (2648B)

      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 # writableProperties
     22 
     23 > Return an array of an object's own writable property names and symbols.
     24 
     25 <section class="usage">
     26 
     27 ## Usage
     28 
     29 ```javascript
     30 var writableProperties = require( '@stdlib/utils/writable-properties' );
     31 ```
     32 
     33 #### writableProperties( obj )
     34 
     35 Returns an `array` of an object's own writable property names and symbols.
     36 
     37 ```javascript
     38 var obj = {
     39     'a': 1,
     40     'b': 2
     41 };
     42 
     43 var props = writableProperties( obj );
     44 // e.g., returns [ 'a', 'b' ]
     45 ```
     46 
     47 </section>
     48 
     49 <!-- /.usage -->
     50 
     51 <section class="notes">
     52 
     53 ## Notes
     54 
     55 -   Property order is not guaranteed, as `object` property enumeration is not specified according to the [ECMAScript specification][ecma-262-for-in]. In practice, however, most engines use insertion order to sort an `object`'s properties, thus allowing for deterministic extraction.
     56 
     57 </section>
     58 
     59 <!-- /.notes -->
     60 
     61 <section class="examples">
     62 
     63 ## Examples
     64 
     65 <!-- eslint no-undef: "error" -->
     66 
     67 ```javascript
     68 var defineProperty = require( '@stdlib/utils/define-property' );
     69 var hasSymbolSupport = require( '@stdlib/assert/has-symbol-support' );
     70 var Symbol = require( '@stdlib/symbol/ctor' );
     71 var writableProperties = require( '@stdlib/utils/writable-properties' );
     72 
     73 var hasSymbols = hasSymbolSupport();
     74 var props;
     75 var obj;
     76 
     77 function Foo() {
     78     this.a = 'a';
     79     defineProperty( this, 'b', {
     80         'configurable': true,
     81         'enumerable': true,
     82         'writable': false,
     83         'value': 'b'
     84     });
     85     if ( hasSymbols ) {
     86         this[ Symbol( 'a' ) ] = 'a';
     87         defineProperty( this, Symbol( 'b' ), {
     88             'configurable': true,
     89             'enumerable': true,
     90             'writable': false,
     91             'value': 'b'
     92         });
     93     }
     94     return this;
     95 }
     96 
     97 Foo.prototype.c = 'c';
     98 if ( hasSymbols ) {
     99     Foo.prototype[ Symbol( 'c' ) ] = 'c';
    100 }
    101 
    102 obj = new Foo();
    103 props = writableProperties( obj );
    104 
    105 console.log( props );
    106 // e.g., => [ 'a', ... ]
    107 ```
    108 
    109 </section>
    110 
    111 <!-- /.examples -->
    112 
    113 <section class="links">
    114 
    115 [ecma-262-for-in]: http://www.ecma-international.org/ecma-262/5.1/#sec-12.6.4
    116 
    117 </section>
    118 
    119 <!-- /.links -->