function isNil(value) {
      return value == null;
    }
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