In this Article we will go through how to prefix an integer with zeros only using single line of code in JavaScript.
This is a one-line JavaScript code snippet that uses one of the most popular ES6 features => `Arrow Function`

.

Let's define this short function:

```
const prefixWithZeros = (number, length) => (number / Math.pow(10, length)).toFixed(length).substr(2);
```

```
const prefixWithZeros = (number, length) => `${Array(length).join('0')}${number}`.slice(-length);
```

```
const prefixWithZeros = (number, length) => String(number).padStart(length, '0');
```

```
prefixWithZeros(42, 5); // '00042'
```

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