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* @license Apache-2.0
*
* Copyright (c) 2021 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var isFunction = require( '@stdlib/assert/is-function' );
var function2string = require( '@stdlib/function/to-string' );
// VARIABLES //
var RE_ARROW_FUNCTION = /^(?:\([^)]*\) *|[^=]*)=>/;
// MAIN //
/**
* Tests whether a value is an arrow function.
*
* @param {*} value - value to test
* @returns {boolean} boolean indicating whether a value is an arrow function
*
* @example
* var arrow = () => {};
* var bool = isArrowFunction( arrow );
* // returns true
*
* @example
* function beep() {
* return 'beep';
* }
*
* var bool = isArrowFunction( beep );
* // returns false
*/
function isArrowFunction( value ) {
var str;
if ( !isFunction( value ) ) {
return false;
}
str = function2string( value );
return RE_ARROW_FUNCTION.test( str );
}
// EXPORTS //
module.exports = isArrowFunction;
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