---
url: /docs/guide/usage/linter/rules/eslint/no-bitwise.md
---

### What it does

Disallow bitwise operators.

### Why is this bad?

The use of bitwise operators in JavaScript is very rare and often `&` or `|` is simply a mistyped `&&` or `||`,
which will lead to unexpected behavior.

### Examples

Examples of **incorrect** code for this rule:

```javascript
var x = y | z;
```

```javascript
var x = y ^ z;
```

```javascript
var x = y >> z;
```

Examples of **correct** code for this rule:

```javascript
var x = y || z;
```

```javascript
var x = y && z;
```

```javascript
var x = y > z;
```

## Configuration

This rule accepts a configuration object with the following properties:

### allow

type: `string[]`

default: `[]`

The `allow` option permits the given list of bitwise operators to be used
as exceptions to this rule.

For example `{ "allow": ["~"] }` would allow the use of the bitwise operator
`~` without restriction. Such as in the following:

```javascript
~[1, 2, 3].indexOf(1) === -1;
```

### int32Hint

type: `boolean`

default: `false`

When set to `true` the `int32Hint` option allows the use of bitwise OR in |0
pattern for type casting.

For example with `{ "int32Hint": true }` the following is permitted:

```javascript
const b = a | 0;
```

## How to use

## Version

This rule was added in v0.0.3.

## References