# Clamp number

JavaScript, Math · Oct 22, 2020

Clamps `num`

within the inclusive range specified by the boundary values `a`

and `b`

.

- If
`num`

falls within the range, return`num`

. - Otherwise, return the nearest number in the range.

```
const clampNumber = (num, a, b) =>
Math.max(Math.min(num, Math.max(a, b)), Math.min(a, b));
```

```
clampNumber(2, 3, 5); // 3
clampNumber(1, -1, -5); // -1
```