# Answers for "check if variable is number"

-2

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
4

javascript check if variable is number

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

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
0

check if value is number

``````if(isNaN(num1))
OR:
if(typeof num1 == 'number'){
document.write(num1 + " is a number <br/>");
}else{
document.write(num1 + " is not a number <br/>");
}``````
Posted by: Guest on September-12-2021
0

check if something is a number

``````<html>
<body>
<h1>isNaN() example</h1>

<script type="text/javascript">
var num1 = 100;
if(isNaN(num1)){
document.write(num1 + " is not a number <br/>");
}else{
document.write(num1 + " is a number <br/>");
}

var str1 = "mkyong"
if(isNaN(str1)){
document.write(str1 + " is not a number <br/>");
}else{
document.write(str1 + " is a number <br/>");
}
</script>

</body>
</html>``````
Posted by: Guest on November-23-2020