			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;

rOACCT/node_modules/lodash/isNaN.js
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isNaN.js
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