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42 lines
1.1 KiB
42 lines
1.1 KiB
var isObject = require('./isObject');
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/** `Object#toString` result references. */
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var funcTag = '[object Function]',
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genTag = '[object GeneratorFunction]',
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proxyTag = '[object Proxy]';
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/** Used for built-in method references. */
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var objectProto = Object.prototype;
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/**
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* Used to resolve the
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* [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
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* of values.
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*/
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var objectToString = objectProto.toString;
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/**
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* Checks if `value` is classified as a `Function` object.
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*
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* @static
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* @memberOf _
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* @since 0.1.0
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* @category Lang
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* @param {*} value The value to check.
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* @returns {boolean} Returns `true` if `value` is a function, else `false`.
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* @example
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*
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* _.isFunction(_);
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* // => true
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*
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* _.isFunction(/abc/);
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* // => false
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*/
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function isFunction(value) {
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// The use of `Object#toString` avoids issues with the `typeof` operator
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// in Safari 9 which returns 'object' for typed array and other constructors.
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var tag = isObject(value) ? objectToString.call(value) : '';
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return tag == funcTag || tag == genTag || tag == proxyTag;
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}
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module.exports = isFunction;
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