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# How to use the parseInt() function in JavaScript

The parseInt() function is a built-in function in JavaScript which allows users to convert a string to an integer value.

## Syntax

The basic syntax of the function is:

### Parameters

The parseInt() function takes the following parameters as input:

• String: The string to convert to an Integer value
• Radix: Specifies the numeral system i.e., the base of the number

Radix is an optional parameter. In case it is not mentioned, the following assumptions are made:

1. If the string begins with 0x, the base is considered 16 (hexadecimal)
2. If the string begins with 0, the base is considered to be either 8 (octal) or 10 (decimal), depending on the system implementation
3. For any other starting value of the input string, the base is assumed to be 10 (decimal)

### Return value

If the function parses the string successfully, the integer value is returned. In case the string cannot be converted to an integer value, NaN is returned.

Note: In case the string starts with a numeric character but is followed by an alpha-numeric character, the string is parsed until the occurrence of the first alphanumeric character



## Example

Let’s look at some examples to understand further how to use the parseInt() function:

• JavaScript

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javascript
parse
int