JSFiddle - React, Tailwind, and code Playground

by Chuan Shao

JavaScript

//Test Infinity
var a = Number.MAX_VALUE;
console.log(a*1.1);//Infinity
console.log(a*-1.1);//-Infinity
console.log(1/0);//Infinity
console.log(-1/0);//-Infinity

//Test positive/negative 0
var b = Number.MIN_VALUE;
console.log(b/2);//0
console.log(-b/2);//0

//Test NaN
console.log(0/0);//NaN
console.log(Infinity/Infinity);//NaN
console.log(Math.sqrt(-1));//NaN
console.log(parseInt("string"));//NaN

//Test Infinity comparison
console.log(Infinity === Number.POSITIVE_INFINITY);//true
console.log(-Infinity === Number.NEGATIVE_INFINITY);//true

//Test NaN comparison
console.log(NaN === NaN);//false

//Test isNaN()
console.log(isNaN(NaN));//true
console.log(isNaN("42"));//false
console.log(isNaN("string"));//true
console.log(isNaN({}));//true
console.log(isNaN(undefined));//true
console.log(isNaN(null));//false

//Test isFinite()
console.log(isFinite(42));//true
console.log(isFinite(Infinity));//false
console.log(isFinite(NaN));//false
console.log(isFinite("29"));//true
console.log(isFinite("string"));//false
console.log(isFinite(null));//true
console.log(isFinite(undefined));//false
console.log(isFinite(true));//true
console.log(isFinite(false));//true