Last change
on this file since 571e0df was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
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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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