JavaScript check if number using isNaN

Check if variable is a Number using isNaN

by Swami

HTML

<h1>Check if variable is a Number using isNaN</h1>
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JavaScript

var number1 = 10;
var number2 = "10a";
var number3 = "10";
var number4 = 10.1;

console.log(number1+" is a number? " + !isNaN(number1));
console.log(number2+" is a number? " + !isNaN(number2));
console.log(number3+" is a number? " + !isNaN(number3));
console.log(number4+" is a number? " + !isNaN(number4));