HORIZON PROJECT

var isNumber = require('./isNumber');

/**

 * Checks if `value` is `NaN`.

 *

 * **Note:** This method is based on

 * [`Number.isNaN`](https://mdn.io/Number/isNaN) and is not the same as

 * global [`isNaN`](https://mdn.io/isNaN) which returns `true` for

 * `undefined` and other non-number values.

 *

 * @static

 * @memberOf _

 * @since 0.1.0

 * @category Lang

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

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

 * @example

 *

 * _.isNaN(NaN);

 * // => true

 *

 * _.isNaN(new Number(NaN));

 * // => true

 *

 * isNaN(undefined);

 * // => true

 *

 * _.isNaN(undefined);

 * // => false

 */

function isNaN(value) {

  // An `NaN` primitive is the only value that is not equal to itself.

  // Perform the `toStringTag` check first to avoid errors with some

  // ActiveX objects in IE.

  return isNumber(value) && value != +value;

}

module.exports = isNaN;