# ngraminator

A really small ngram generator for Node.js and the browser. Check out the [interactive demo](https://fergiemcdowall.github.io/ngraminator/demo/).

[![NPM version][npm-version-image]][npm-url]
[![NPM downloads][npm-downloads-image]][npm-url]
[![](https://data.jsdelivr.com/v1/package/npm/ngraminator/badge?style=rounded)](https://www.jsdelivr.com/package/npm/ngraminator)
[![Build Status][CI-image]][CI-url]
[![JavaScript Style Guide][standardjs-image]][standardjs-url]
[![MIT License][license-image]][license-url]

## Breaking change
How the library is now required is slightly different. For CommonJS it used to be `const ngraminator = require('ngraminator')`, but now it is `const { ngraminator } = require('ngraminator')`

And UMD used to be `ngraminator()`, but is now `ngrm.ngraminator()`

<img width ="600" alt="Demo at work" src="https://user-images.githubusercontent.com/236656/63688481-d5df0580-c807-11e9-8bf6-67dac790d761.png">

## Initiation

### CJS - CommonJS
```JavaScript
const { ngraminator } = require('ngraminator')
// ngraminator(wordArray, ngramLenghtArray) available
```

### ESM - Ecmascript Modules
```JavaScript
import { ngraminator } from 'ngraminator'
// ngraminator(wordArray, ngramLenghtArray) available
```

### Script tag
```html
<script src="https://cdn.jsdelivr.net/npm/ngraminator/dist/ngraminator.umd.min.js"></script>

<script>
// ngrm.ngraminator(wordArray, ngramLenghtArray) available
</script>
```

## Usage

```javascript
const str = "mary had a little lamb it's fleece"

// get ngrams of length 3
ngraminator(str.split(' '), [3])
// [
//   ['mary', 'had', 'a'],
//   ['had', 'a', 'little'],
//   ['a', 'little', 'lamb'],
//   ['little', 'lamb', 'it\'s'],
//   ['lamb', 'it\'s', 'fleece']
// ]

// get ngrams of lengths 1 and 2
ngraminator(str.split(' '), [1, 2])
// [
//   [ 'mary' ],
//   [ 'had' ],
//   [ 'a' ],
//   [ 'little' ],
//   [ 'lamb' ],
//   [ 'it\'s' ],
//   [ 'fleece' ],
//   [ 'mary', 'had' ],
//   [ 'had', 'a' ],
//   [ 'a', 'little' ],
//   [ 'little', 'lamb' ],
//   [ 'lamb', 'it\'s' ],
//   [ 'it\'s', 'fleece' ]
// ]

// get ngrams of lengths 1, 2, and 5
ngraminator(str.split(' '), [1, 2, 5])
// [
//   [ 'a' ],
//   [ 'a', 'little' ],
//   [ 'a', 'little', 'lamb', 'it\'s', 'fleece' ],
//   [ 'fleece' ],
//   [ 'had' ],
//   [ 'had', 'a' ],
//   [ 'had', 'a', 'little', 'lamb', 'it\'s' ],
//   [ 'it\'s' ],
//   [ 'it\'s', 'fleece' ],
//   [ 'lamb' ],
//   [ 'lamb', 'it\'s' ],
//   [ 'little' ],
//   [ 'little', 'lamb' ],
//   [ 'mary' ],
//   [ 'mary', 'had' ],
//   [ 'mary', 'had', 'a', 'little', 'lamb' ]
// ]
//

// get ngrams of lengths 1, 2, and 5 stringified
ngraminator(str.split(' '), [1, 2, 5]).map(item => item.join(' '))
// [
//   "a",
//   "a little",
//   "a little lamb it's fleece",
//   "fleece",
//   "had",
//   "had a",
//   "had a little lamb it's",
//   "it's",
//   "it's fleece",
//   "lamb",
//   "lamb it's",
//   "little",
//   "little lamb",
//   "mary",
//   "mary had",
//   "mary had a little lamb"
// ]
//

```

[license-image]: http://img.shields.io/badge/license-MIT-blue.svg?style=flat
[license-url]: LICENSE
[npm-url]: https://npmjs.org/package/ngraminator
[npm-version-image]: http://img.shields.io/npm/v/ngraminator.svg?style=flat
[npm-downloads-image]: http://img.shields.io/npm/dm/ngraminator.svg?style=flat
[CI-url]: https://github.com/fergiemcdowall/ngraminator/actions/workflows/tests.yml
[CI-image]: https://github.com/fergiemcdowall/ngraminator/actions/workflows/tests.yml/badge.svg
[standardjs-url]: https://standardjs.com
[standardjs-image]: https://img.shields.io/badge/code_style-standard-brightgreen.svg?style=flat-square