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build/node_modules/is-nan-x/index.js

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+/**
+ * @file ES6-compliant shim for Number.isNaN - the global isNaN returns false positives.
+ * @version 1.0.1
+ * @author Xotic750 <Xotic750@gmail.com>
+ * @copyright  Xotic750
+ * @license {@link <https://opensource.org/licenses/MIT> MIT}
+ * @module is-nan-x
+ */
+
+'use strict';
+
+/**
+ * This method determines whether the passed value is NaN and its type is
+ * `Number`. It is a more robust version of the original, global isNaN().
+ *
+ * @param {*} value - The value to be tested for NaN.
+ * @returns {boolean} `true` if the given value is NaN and its type is Number;
+ *  otherwise, `false`.
+ * @example
+ * var numberIsNaN = require('is-nan-x');
+ *
+ * numberIsNaN(NaN);        // true
+ * numberIsNaN(Number.NaN); // true
+ * numberIsNaN(0 / 0);      // true
+ *
+ * // e.g. these would have been true with global isNaN()
+ * numberIsNaN('NaN');      // false
+ * numberIsNaN(undefined);  // false
+ * numberIsNaN({});         // false
+ * numberIsNaN('blabla');   // false
+ *
+ * // These all return false
+ * numberIsNaN(true);
+ * numberIsNaN(null);
+ * numberIsNaN(37);
+ * numberIsNaN('37');
+ * numberIsNaN('37.37');
+ * numberIsNaN('');
+ * numberIsNaN(' ');
+ */
+module.exports = function isNaN(value) {
+  return value !== value;
+};