51 lines
1.2 KiB
JavaScript
51 lines
1.2 KiB
JavaScript
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/**
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* @license Apache-2.0
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*
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* Copyright (c) 2018 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MODULES //
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var typeOf = require( '@stdlib/utils/type-of' );
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// MAIN //
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/**
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* Tests if a value is a function.
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*
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* @param {*} value - value to test
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* @returns {boolean} boolean indicating whether value is a function
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*
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* @example
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* function beep() {
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* return 'beep';
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* }
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*
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* var bool = isFunction( beep );
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* // returns true
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*/
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function isFunction( value ) {
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// Note: cannot use `typeof` directly, as various browser engines incorrectly return `'function'` when operating on non-function objects, such as regular expressions and NodeLists.
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return ( typeOf( value ) === 'function' );
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}
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// EXPORTS //
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module.exports = isFunction;
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