isNil.js

define([], function() {

  /**
   * Checks if `value` is `null` or `undefined`.
   *
   * @static
   * @memberOf _
   * @since 4.0.0
   * @category Lang
   * @param {*} value The value to check.
   * @returns {boolean} Returns `true` if `value` is nullish, else `false`.
   * @example
   *
   * _.isNil(null);
   * // => true
   *
   * _.isNil(void 0);
   * // => true
   *
   * _.isNil(NaN);
   * // => false
   */
  function isNil(value) {
    return value == null;
  }

  return isNil;
});