Answers for "check if variable is number"


javascript check if number

// The first 2 Variations return a Boolean
// They just work the opposite way around

// IsInteger
if (Number.isInteger(val)) {
	// It is indeed a number

// isNaN (is not a number)
if (isNaN(val)) {
	// It is not a number

// Another option is typeof which return a string
if (typeof(val) === 'number') {
	// Guess what, it's a bloody number!
Posted by: Guest on March-15-2020

javascript check if variable is number

function isNumber(n) {
  return !isNaN(parseFloat(n)) && !isNaN(n - 0);
Posted by: Guest on May-22-2020

check if a variable is a number in javascript

// as test cases we have two variables of which 1 is a number and the second one is a string
let x = 7;
let y = "hello"
let result1 = !Number.isNaN(x) // true
let result2 = !Number.isNaN(y) // flase
Posted by: Guest on June-01-2021

check if value is number

if(typeof num1 == 'number'){
    document.write(num1 + " is a number <br/>");
    document.write(num1 + " is not a number <br/>");
Posted by: Guest on September-12-2021

check if something is a number

<h1>isNaN() example</h1>

<script type="text/javascript">
 var num1 = 100;
    document.write(num1 + " is not a number <br/>");
    document.write(num1 + " is a number <br/>");
 var str1 = "mkyong"
    document.write(str1 + " is not a number <br/>");
    document.write(str1 + " is a number <br/>");

Posted by: Guest on November-23-2020

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