# Logical xor operator

True when exactly one of two values is truthy.

Canonical: https://1loc.dev/function/logical-xor-operator/
Version: 1.0.0
Runtime: JavaScript · Node.js 22 / modern browsers
Verification: Local fixtures; no external services
Updated: 2026-10-28

## Implementation

```javascript
function xor([a, b]) { return Boolean(a) !== Boolean(b); }
```

## Input

```json
[
  true,
  false
]
```

## Expected output

```json
true
```

## Edge case

Input:
```json
[
  "",
  "y"
]
```
Output:
```json
true
```

## Limits

- Operands are converted to booleans first. The original’s (a && !b) || (!a && b) returns an operand instead: for the edge case it returns "y", not true.
- The lab takes the two values as an array.

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/logical-xor-operator.mdx
Author: Nguyen Huu Phuoc and original contributors
Contributors: See original repository history
Source commit: 14b481cf60dff1620ab1bb99a43b1f68068cdd9b
Copyright (c) 2020 phuoc-ng
License: MIT — https://1loc.dev/licenses/
Maintainer: Oveyon
Modifications: Returns a boolean; the original could return one of its operands instead of true or false. Original MDX retained as inert source evidence.