HORIZON PROJECT

var baseGetTag = require('./_baseGetTag'),

    isObject = require('./isObject');

/** `Object#toString` result references. */

var asyncTag = '[object AsyncFunction]',

    funcTag = '[object Function]',

    genTag = '[object GeneratorFunction]',

    proxyTag = '[object Proxy]';

/**

 * Checks if `value` is classified as a `Function` object.

 *

 * @static

 * @memberOf _

 * @since 0.1.0

 * @category Lang

 * @param {*} value The value to check.

 * @returns {boolean} Returns `true` if `value` is a function, else `false`.

 * @example

 *

 * _.isFunction(_);

 * // => true

 *

 * _.isFunction(/abc/);

 * // => false

 */

function isFunction(value) {

  if (!isObject(value)) {

    return false;

  }

  // The use of `Object#toString` avoids issues with the `typeof` operator

  // in Safari 9 which returns 'object' for typed arrays and other constructors.

  var tag = baseGetTag(value);

  return tag == funcTag || tag == genTag || tag == asyncTag || tag == proxyTag;

}

module.exports = isFunction;