ES2015 Number.isNaN() ponyfill
ES6-compliant shim for Number.isNaN - the global isNaN returns false positives.
List of JavaScript methods which you can use natively + ESLint Plugin
JavaScript/Node.js utility. Returns `true` if the value is a number or string number. Useful for checking regex match results, user input, parsed strings, etc.
Computes for each array element whether an element is NaN.
A `Number.isNaN` polyfill, based on the ECMAScript 6 specification.
とりあえずなにか