npm package: @stdlib/number-uint32-base-rotl
Description: Bitwise rotation to the left.
Author: The Stdlib Authors
Latest version: 0.2.3

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# Bitwise Rotation

[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url] <!-- [![dependencies][dependencies-image]][dependencies-url] -->

> Bitwise rotation to the left.

<section class="installation">

## Installation

```bash
npm install @stdlib/number-uint32-base-rotl
```

</section>

<section class="usage">

## Usage

```javascript
var rotl32 = require( '@stdlib/number-uint32-base-rotl' );
```

#### rotl32( x, shift )

Performs a bitwise rotation to the left.

```javascript
var toBinaryStringUint32 = require( '@stdlib/number-uint32-base-to-binary-string' );

var x = 2147483649;
var bstr = toBinaryStringUint32( x );
// returns '10000000000000000000000000000001'

var y = rotl32( x, 10 );
// returns 1536

bstr = toBinaryStringUint32( y );
// returns '00000000000000000000011000000000'
```

</section>

<!-- /.usage -->

<section class="notes">

## Notes

-   If provided a `shift` equal to `0`, the function returns the input value.

    ```javascript
    var y = rotl32( 3, 0 );
    // returns 3
    ```

-   If provided a `shift` greater than `31`, the function performs a bitwise rotation based on the `5` least significant bits of `shift` (i.e., `shift % 32`).

    ```javascript
    var shift = 34; // 00000000000000000000000000100010

    var y = rotl( 1, shift ); // 00000000000000000000000000000100
    // returns 4
    ```

</section>

<!-- /.notes -->

<section class="examples">

## Examples

<!-- eslint no-undef: "error" -->

```javascript
var toBinaryStringUint32 = require( '@stdlib/number-uint32-base-to-binary-string' );
var MAX_INT = require( '@stdlib/constants-uint32-max' );
var rotl32 = require( '@stdlib/number-uint32-base-rotl' );

var HALF;
var x;
var y;
var i;

for ( i = 0; i < 100; i++ ) {
    x = i;
    y = rotl32( x, 10 );
    console.log( '%d => %s => %s => %d', x, toBinaryStringUint32( x ), toBinaryStringUint32( y ), y );
}

HALF = (MAX_INT+1) / 2;
for ( i = 0; i < 100; i++ ) {
    x = HALF + i;
    y = rotl32( x, 10 );
    console.log( '%d => %s => %s => %d', x, toBinaryStringUint32( x ), toBinaryStringUint32( y ), y );
}
```

</section>

<!-- /.examples -->

<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->

<section class="related">

* * *

## See Also

-   <span class="package-name">[`@stdlib/number-uint32/base/rotr`][@stdlib/number/uint32/base/rotr]</span><span class="delimiter">: </span><span class="description">bitwise rotation to the right.</span>

</section>

<!-- /.related -->

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<section class="main-repo" >

* * *

## Notice

This package is part of [stdlib][stdlib], a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

For more information on the project, filing bug reports and feature requests, and guidance on how to develop [stdlib][stdlib], see the main project [repository][stdlib].

#### Community

[![Chat][chat-image]][chat-url]

---

## License

See [LICENSE][stdlib-license].


## Copyright

Copyright &copy; 2016-2026. The Stdlib [Authors][stdlib-authors].

</section>

<!-- /.stdlib -->

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<!-- <related-links> -->

[@stdlib/number/uint32/base/rotr]: https://www.npmjs.com/package/@stdlib/number-uint32-base-rotr

<!-- </related-links> -->

</section>

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