time-to-botec

Benchmark sampling in different programming languages
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README.md (3005B)

      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 # nonEnumerablePropertySymbols
     22 
     23 > Return an array of an object's own non-enumerable symbol properties.
     24 
     25 <section class="usage">
     26 
     27 ## Usage
     28 
     29 <!-- eslint-disable id-length -->
     30 
     31 ```javascript
     32 var nonEnumerablePropertySymbols = require( '@stdlib/utils/nonenumerable-property-symbols' );
     33 ```
     34 
     35 #### nonEnumerablePropertySymbols( obj )
     36 
     37 Returns an `array` of an object's own non-enumerable symbol properties.
     38 
     39 ```javascript
     40 var hasSymbolSupport = require( '@stdlib/assert/has-symbol-support' );
     41 var Symbol = require( '@stdlib/symbol/ctor' );
     42 var defineProperty = require( '@stdlib/utils/define-property' );
     43 
     44 var obj = {};
     45 
     46 if ( hasSymbolSupport() ) {
     47     defineProperty( obj, Symbol( 'a' ), {
     48         'configurable': false,
     49         'enumerable': false,
     50         'writable': true,
     51         'value': 'b'
     52     });
     53 }
     54 
     55 var symbols = nonEnumerablePropertySymbols( obj );
     56 ```
     57 
     58 </section>
     59 
     60 <!-- /.usage -->
     61 
     62 <section class="notes">
     63 
     64 ## Notes
     65 
     66 -   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.
     67 
     68 </section>
     69 
     70 <!-- /.notes -->
     71 
     72 <section class="examples">
     73 
     74 ## Examples
     75 
     76 <!-- eslint-disable id-length -->
     77 
     78 <!-- eslint no-undef: "error" -->
     79 
     80 ```javascript
     81 var defineProperty = require( '@stdlib/utils/define-property' );
     82 var hasSymbolSupport = require( '@stdlib/assert/has-symbol-support' );
     83 var Symbol = require( '@stdlib/symbol/ctor' );
     84 var nonEnumerablePropertySymbols = require( '@stdlib/utils/nonenumerable-property-symbols' );
     85 
     86 var hasSymbols = hasSymbolSupport();
     87 var symbols;
     88 var obj;
     89 
     90 function Foo() {
     91     if ( hasSymbols ) {
     92         defineProperty( this, Symbol( 'baz' ), {
     93             'configurable': false,
     94             'enumerable': false,
     95             'writable': true,
     96             'value': 'qux'
     97         });
     98     }
     99     return this;
    100 }
    101 
    102 if ( hasSymbols ) {
    103     defineProperty( Foo.prototype, Symbol( 'bip' ), {
    104         'configurable': false,
    105         'enumerable': false,
    106         'writable': false,
    107         'value': 'bop'
    108     });
    109 }
    110 
    111 obj = new Foo();
    112 symbols = nonEnumerablePropertySymbols( obj );
    113 
    114 console.log( symbols );
    115 ```
    116 
    117 </section>
    118 
    119 <!-- /.examples -->
    120 
    121 <section class="links">
    122 
    123 [ecma-262-for-in]: http://www.ecma-international.org/ecma-262/5.1/#sec-12.6.4
    124 
    125 </section>
    126 
    127 <!-- /.links -->