Author -  Sai gowtham

# Get the first 2 digits of a number in JavaScript

In this tutorial, we will learn how to get the first 2 digits of a number in JavaScript.

Note: In JavaScript, strings are the sequence of characters, where the index of the first character is `0`, the second character is `1`, third character is `3` etc.

## Getting the first 2 digits of a number

To get the first 2 digits of a number, convert the number to a string and use the built-in `substring()` method by passing the `0, 2` as an arguments to it. Then convert the string back to a number.

Where `0` is the start index, 2 is the end index which is excluded from the output.

Here is an example:

``````const id = 2345;

const firstTwoNumbers = String(id).substring(0, 2);
console.log(Number(firstTwoNumbers));``````

Output:

``23``

In the example above, we have passed `0, 2` as an arguments to the substring() method. so it begins the extraction at index `0` and extracts before the index 2 of a string.

The `String()` and `Number()` functions are used to convert the string to a number or vice versa.

Alternatively, we can also the `slice()` method in JavaScript, to access the first 2 digits of a number.

Here is an example:

``````const id = 2345;

const firstTwoNumbers = String(id).slice(0, 2);
console.log(Number(firstTwoNumbers));``````

Output:

``23``

The slice() method takes the two arguments, the first argument is start index and the second argument is end index then it returns a new string between the start index and end index (that is excluded from the output).

Also , we can use the regular expression to access the first 2 digits of a number.

Here is an example:

``````const id = 2345;

const firstTwoNumbers = String(id).match(/\d{2}/)[0];
console.log(Number(firstTwoNumbers)); // 23``````

The regular expression `/\d{2}/`, where d matches the numbers ranging from 0 to 9 and extracts the first 2 characters from the string.

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