# JavaScript parseint function| Convert a string to an integer Example

The javaScript parseint() method is to convert a string to an integer (Number). The parseInt() is an inbuilt function in JavaScript, it accepts the string, radix parameter, and converts it into an integer. If the given string doesn’t contain numbers, it returns Nan( not a number)

### Syntax

``parseInt(string, radix)``

### Parameter Values

• string: A given value want to parse to int.
• radix: Its and Optional. An integer between 2 and 36 represents the radix (the base in mathematical numeral systems) of the string.

### Return value

An integer parsed from the given string.

## Examples of JavaScript parseint() function

Let’s see the example with different type of input.

Parse different strings:

``````<!DOCTYPE html>
<html>
<body>
<script>

a = parseInt("100");
document.write('parseInt("100") = ' + a + "<br>");

// It returns a Integer until
// it encounters Not a Number character
b = parseInt("2020@Covid19");
document.write('parseInt("2020@Covid19") = ' + b + "<br>");

// It returns NaN on Non numeral character
c = parseInt("Covid19");
document.write('parseInt("Covid19") = ' + c + "<br>");

// It returns Integer value of a Floating point Number
d = parseInt("3.14");
document.write('parseInt("3.14") = ' + d + "<br>");

// It returns only first Number it encounters
e = parseInt("21 7 2018");
document.write('parseInt("21 7 2020") = ' + e + "<br>");

</script>

</body>
</html>  ``````

Output:

### Parseint negative number javascript

``````var x = parseInt("-2147483648");
console.log(x);``````

### Q: How to convert a string into an integer in JavaScript?

Answer: You can converts string and into an integer using a parseInt() function.

`````` var a = "10";
var b = parseInt(a);``````