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on this file was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
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[6a3a178] | 1 | var baseGetTag = require('./_baseGetTag'),
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| 2 | isObject = require('./isObject');
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| 3 |
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| 4 | /** `Object#toString` result references. */
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| 5 | var asyncTag = '[object AsyncFunction]',
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| 6 | funcTag = '[object Function]',
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| 7 | genTag = '[object GeneratorFunction]',
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| 8 | proxyTag = '[object Proxy]';
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| 9 |
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| 10 | /**
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| 11 | * Checks if `value` is classified as a `Function` object.
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| 12 | *
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| 13 | * @static
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| 14 | * @memberOf _
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| 15 | * @since 0.1.0
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| 16 | * @category Lang
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| 17 | * @param {*} value The value to check.
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| 18 | * @returns {boolean} Returns `true` if `value` is a function, else `false`.
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| 19 | * @example
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| 20 | *
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| 21 | * _.isFunction(_);
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| 22 | * // => true
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| 23 | *
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| 24 | * _.isFunction(/abc/);
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| 25 | * // => false
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| 26 | */
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| 27 | function isFunction(value) {
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| 28 | if (!isObject(value)) {
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| 29 | return false;
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| 30 | }
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| 31 | // The use of `Object#toString` avoids issues with the `typeof` operator
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| 32 | // in Safari 9 which returns 'object' for typed arrays and other constructors.
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| 33 | var tag = baseGetTag(value);
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| 34 | return tag == funcTag || tag == genTag || tag == asyncTag || tag == proxyTag;
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| 35 | }
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| 36 |
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| 37 | module.exports = isFunction;
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