npm package: @stdlib/slice-base-normalize-slice
Description: Normalize a Slice object.
Author: The Stdlib Authors
Latest version: 0.2.3

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# normalizeSlice

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

> Normalize a [`Slice`][@stdlib/slice/ctor] object.

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<section class="intro">

</section>

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<section class="installation">

## Installation

```bash
npm install @stdlib/slice-base-normalize-slice
```

</section>

<section class="usage">

## Usage

```javascript
var normalizeSlice = require( '@stdlib/slice-base-normalize-slice' );
```

<a name="main"></a>

#### normalizeSlice( slice, len, strict )

Normalizes a [`Slice`][@stdlib/slice/ctor] object, where `len` specifies the maximum number of elements allowed in the slice.

```javascript
var Slice = require( '@stdlib/slice-ctor' );

var s = normalizeSlice( new Slice( -1, null, -1 ), 10, false );
// returns <Slice>

var v = s.start;
// returns 9

v = s.stop;
// returns null

v = s.step;
// returns -1
```

When `strict` is `true`, the function returns an error object if an input slice exceeds index bounds.

```javascript
var Slice = require( '@stdlib/slice-ctor' );

var s = normalizeSlice( new Slice( -20, 20, 1 ), 10, true );
// returns { 'code': 'ERR_SLICE_OUT_OF_BOUNDS' }
```

A returned error object may have one of the following error codes:

-   **ERR_SLICE_OUT_OF_BOUNDS**: a slice exceeds index bounds.

</section>

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<section class="examples">

## Examples

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

```javascript
var Slice = require( '@stdlib/slice-ctor' );
var normalizeSlice = require( '@stdlib/slice-base-normalize-slice' );

var s = normalizeSlice( new Slice(), 5, false );
console.log( 'start: %s. stop: %s. step: %s.', s.start, s.stop, s.step );
// => 'start: 0. stop: 5. step: 1.'

s = normalizeSlice( new Slice( 1, 4, 2 ), 5, false );
console.log( 'start: %s. stop: %s. step: %s.', s.start, s.stop, s.step );
// => 'start: 1. stop: 4. step: 2.'

s = normalizeSlice( new Slice( -1, null, -1 ), 5, false );
console.log( 'start: %s. stop: %s. step: %s.', s.start, s.stop, s.step );
// => 'start: 4. stop: null. step: -1.'

s = normalizeSlice( new Slice( -10, -2, 2 ), 5, false );
console.log( 'start: %s. stop: %s. step: %s.', s.start, s.stop, s.step );
// => 'start: 0. stop: 3. step: 2.'

s = normalizeSlice( new Slice( 1, 20, 2 ), 5, false );
console.log( 'start: %s. stop: %s. step: %s.', s.start, s.stop, s.step );
// => 'start: 1. stop: 5. step: 2.'
```

</section>

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* * *

## See Also

-   <span class="package-name">[`@stdlib/slice-base/normalize-multi-slice`][@stdlib/slice/base/normalize-multi-slice]</span><span class="delimiter">: </span><span class="description">normalize a MultiSlice object.</span>

</section>

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* * *

## 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

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---

## License

See [LICENSE][stdlib-license].


## Copyright

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

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[@stdlib/slice/ctor]: https://www.npmjs.com/package/@stdlib/slice-ctor

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