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* @license Apache-2.0
*
* Copyright (c) 2018 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 typeOf = require( '@stdlib/utils/type-of' );
// MAIN //
/**
* Tests if a value is a function.
*
* @param {*} value - value to test
* @returns {boolean} boolean indicating whether value is a function
*
* @example
* function beep() {
* return 'beep';
* }
*
* var bool = isFunction( beep );
* // returns true
*/
function isFunction( value ) {
// Note: cannot use `typeof` directly, as various browser engines incorrectly return `'function'` when operating on non-function objects, such as regular expressions and NodeLists.
return ( typeOf( value ) === 'function' );
}
// EXPORTS //
module.exports = isFunction;
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