# Get the Last Digit of a Number in JavaScript

Last updated: Aug 28, 2022

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## Get the Last Digit of a Number#

To get the last digit of a number:

1. Convert the number to a string and call the `slice()` method on the string, passing it `-1` as a parameter.
2. The `slice` method will return the last character in the string.
3. Convert the string back to a number to get the last digit.
index.js
```Copied!```// 👇️ Decimal numbers
const num1 = 1357.579;
const lastDigit1Str = String(num1).slice(-1); // 👉️ '9'
const lastDigit1Num = Number(lastDigit1Str); // 9

// 👇️ Integers
const num2 = 1357;
const lastDigit2Str = String(num2).slice(-1); // 👉️ '7'
const lastDigit2Num = Number(lastDigit2Str); // 👉️ 7
``````

This approach works for integer and float numbers.

The first step is to use the `String()` object to convert the number to a string, so we can call the String.slice method on it.

Indexes are zero-based in JavaScript. The index of the first character in a string is `0` and the last character is `str.length - 1`.

The only parameter we passed to the `slice` method is the start index - the index at which to start extraction.

Passing a negative index of `-1` means - give me the last character of the string.

This is the same as passing `string.length - 1` as the start index.

index.js
```Copied!```const str = 'Hello World';

const last1 = str.slice(-1); // 👉️ d
console.log(last1);

const last1Again = str.slice(str.length - 1); // 👉️ d
console.log(last1Again);
``````

The `slice` method returns a string, so the last step is to use the `Number` object to convert it back to a number.