time-to-botec

Benchmark sampling in different programming languages
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main.js (1619B)

      1 /**
      2 * @license Apache-2.0
      3 *
      4 * Copyright (c) 2021 The Stdlib Authors.
      5 *
      6 * Licensed under the Apache License, Version 2.0 (the "License");
      7 * you may not use this file except in compliance with the License.
      8 * You may obtain a copy of the License at
      9 *
     10 *    http://www.apache.org/licenses/LICENSE-2.0
     11 *
     12 * Unless required by applicable law or agreed to in writing, software
     13 * distributed under the License is distributed on an "AS IS" BASIS,
     14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     15 * See the License for the specific language governing permissions and
     16 * limitations under the License.
     17 */
     18 
     19 'use strict';
     20 
     21 // MODULES //
     22 
     23 var isFunction = require( './../../is-function' );
     24 
     25 
     26 // VARIABLES //
     27 
     28 var RE_ARROW_FUNCTION = /^(?:\([^)]*\) *|[^=]*)=>/;
     29 
     30 // Using `Function#toString` bypasses a value's own `toString` method to provide an extra, but not security proof, precaution to prevent a provided function from impersonating an arrow function:
     31 var fcn2str = Function.prototype.toString;
     32 
     33 
     34 // MAIN //
     35 
     36 /**
     37 * Tests whether a value is an arrow function.
     38 *
     39 * @param {*} value - value to test
     40 * @returns {boolean} boolean indicating whether a value is an arrow function
     41 *
     42 * @example
     43 * var arrow = () => {};
     44 * var bool = isArrowFunction( arrow );
     45 * // returns true
     46 *
     47 * @example
     48 * function beep() {
     49 *     return 'beep';
     50 * }
     51 *
     52 * var bool = isArrowFunction( beep );
     53 * // returns false
     54 */
     55 function isArrowFunction( value ) {
     56 	var str;
     57 	if ( !isFunction( value ) ) {
     58 		return false;
     59 	}
     60 	str = fcn2str.call( value );
     61 	return RE_ARROW_FUNCTION.test( str );
     62 }
     63 
     64 
     65 // EXPORTS //
     66 
     67 module.exports = isArrowFunction;