# Wrap a number between two values

Map a number into [min, max) like an angle or a carousel index.

Canonical: https://1loc.dev/number/wrap-a-number-between-two-values/
Version: 1.0.0
Runtime: JavaScript · Node.js 22 / modern browsers
Verification: Local fixtures; no external services
Updated: 2026-10-28

## Implementation

```javascript
function wrap({ num, min, max }) { return ((((num - min) % (max - min)) + (max - min)) % (max - min)) + min; }
```

## Input

```json
{
  "num": 11,
  "min": 0,
  "max": 10
}
```

## Expected output

```json
1
```

## Edge case

Input:
```json
{
  "num": -1,
  "min": 0,
  "max": 10
}
```
Output:
```json
9
```

## Limits

- max is exclusive. The lab requires min < max.

The lab validates types and size before calling this function. Add equivalent validation at your own trust boundary.

## Source and license

Original: https://github.com/phuocng/1loc/blob/14b481cf60dff1620ab1bb99a43b1f68068cdd9b/contents/wrap-a-number-between-two-values.mdx
Author: Nguyen Huu Phuoc and original contributors
Contributors: iamandrewluca
Source commit: 14b481cf60dff1620ab1bb99a43b1f68068cdd9b
Copyright (c) 2020 phuoc-ng
License: MIT — https://1loc.dev/licenses/
Maintainer: Oveyon
Modifications: Curated implementation; explicit input contract, edge case and limits. Original MDX retained as inert source evidence.