# Number isInteger() Method with Example in JavaScript

JavaScript Number isInteger() Method: Here, we are going to learn about the isInteger() method in JavaScript with example.
Submitted by IncludeHelp, on February 07, 2019

## Number isInteger() Method

isInteger() is a Number Method, it is used to check whether a given number is an integer or not.

It returns true if given number is an integer, if given number is not an integer – it returns false.

Syntax:

```    Number.isInteger(number);
```

Examples:

```    Input: 10
Output: true

Input: 10.23
Output: false

Input: "Hello"
Output: False
```

Code:

```<html>
<title>JavaScipt Example</title>
<body>
<script>
document.write("10: " + Number.isInteger(10) + "<br>");
document.write("10.23: " + Number.isInteger(10.23) + "<br>");
document.write("Hello: " + Number.isInteger("Hello") + "<br>");

//checking with variables
var a = 10;
var b = 10.23;
var c = "Hello";

if(Number.isInteger(a)==true)
document.write(a + " is an integer value" + "<br>");
else
document.write(a + " is not an integer value" + "<br>");

if(Number.isInteger(b)==true)
document.write(b + " is an integer value" + "<br>");
else
document.write(b + " is not an integer value" + "<br>");

if(Number.isInteger(c)==true)
document.write(c + " is an integer value" + "<br>");
else
document.write(c + " is not an integer value" + "<br>");
</script>
</body>
</html>
```

Output

```10: true
10.23: false
Hello: false
10 is an integer value
10.23 is not an integer value
Hello is not an integer value
```