README.md (2143B)
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 # Function Name 22 23 > [Regular expression][regexp] to capture a function name. 24 25 <section class="usage"> 26 27 ## Usage 28 29 ```javascript 30 var reFunctionName = require( '@stdlib/regexp/function-name' ); 31 ``` 32 33 #### reFunctionName 34 35 Returns a [regular expression][regexp] to capture a `function` name. 36 37 ```javascript 38 function beep() { 39 return 'boop'; 40 } 41 42 var RE_FUNCTION_NAME = reFunctionName(); 43 var str = RE_FUNCTION_NAME.exec( beep.toString() )[ 1 ]; 44 // returns 'beep' 45 ``` 46 47 #### reFunctionName.REGEXP 48 49 [Regular expression][regexp] to capture a `function` name. 50 51 <!-- eslint-disable stdlib/no-builtin-math --> 52 53 ```javascript 54 var str = reFunctionName.REGEXP.exec( Math.sqrt.toString() )[ 1 ]; 55 // returns 'sqrt' 56 ``` 57 58 </section> 59 60 <!-- /.usage --> 61 62 <section class="examples"> 63 64 ## Examples 65 66 <!-- eslint-disable func-names, no-restricted-syntax, no-empty-function, stdlib/no-builtin-math --> 67 68 <!-- eslint no-undef: "error" --> 69 70 ```javascript 71 var Int8Array = require( '@stdlib/array/int8' ); 72 var reFunctionName = require( '@stdlib/regexp/function-name' ); 73 var RE_FUNCTION_NAME = reFunctionName(); 74 75 function fname( fcn ) { 76 return RE_FUNCTION_NAME.exec( fcn.toString() )[ 1 ]; 77 } 78 79 var f = fname( Math.sqrt ); 80 // returns 'sqrt' 81 82 f = fname( Int8Array ); 83 // returns 'Int8Array' 84 85 f = fname( Object.prototype.toString ); 86 // returns 'toString' 87 88 f = fname( function () {} ); 89 // returns '' 90 ``` 91 92 </section> 93 94 <!-- /.examples --> 95 96 <section class="links"> 97 98 [regexp]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions 99 100 </section> 101 102 <!-- /.links -->