code: function isFunction(value) {
    if (!isObject$1(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;
  }
docs: 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