README.md (2141B)
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 # Native Function 22 23 > [Regular expression][regexp] to match a native function. 24 25 <section class="usage"> 26 27 ## Usage 28 29 ```javascript 30 var reNativeFunction = require( '@stdlib/regexp/native-function' ); 31 ``` 32 33 #### reNativeFunction() 34 35 Returns a [regular expression][regexp] to match a native `function`. 36 37 ```javascript 38 var RE_NATIVE_FUNCTION = reNativeFunction(); 39 var bool = RE_NATIVE_FUNCTION.test( Date.toString() ); 40 // returns true 41 ``` 42 43 #### reNativeFunction.REGEXP 44 45 [Regular expression][regexp] to match a native `function`. 46 47 ```javascript 48 var bool = reNativeFunction.REGEXP.test( Date.toString() ); 49 // returns true 50 ``` 51 52 </section> 53 54 <!-- /.usage --> 55 56 <section class="examples"> 57 58 ## Examples 59 60 <!-- eslint-disable no-restricted-syntax, no-empty-function, stdlib/no-builtin-math --> 61 62 <!-- eslint no-undef: "error" --> 63 64 ```javascript 65 var Int8Array = require( '@stdlib/array/int8' ); 66 var reNativeFunction = require( '@stdlib/regexp/native-function' ); 67 68 var RE_NATIVE_FUNCTION = reNativeFunction(); 69 function isNativeFunction( fcn ) { 70 return RE_NATIVE_FUNCTION.test( fcn.toString() ); 71 } 72 73 var bool = isNativeFunction( Math.sqrt ); 74 // returns true 75 76 bool = isNativeFunction( String ); 77 // returns true 78 79 bool = isNativeFunction( Int8Array ); 80 // returns true 81 82 bool = isNativeFunction( Date ); 83 // returns true 84 85 bool = isNativeFunction( function noop() {} ); 86 // returns false 87 ``` 88 89 </section> 90 91 <!-- /.examples --> 92 93 <section class="links"> 94 95 [regexp]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions 96 97 </section> 98 99 <!-- /.links -->