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# irregular-plurals [](https://travis-ci.org/sindresorhus/irregular-plurals)
> Map of nouns to their irregular plural form
> An irregular plural in this library is defined as a noun that cannot be made plural by applying these rules:
> - If the noun ends in an "s", "x", "z", "ch" or "sh", add "es"
> - If the noun ends in a "y" and is preceded by a consonent, drop the "y" and add "ies"
> - If the noun ends in a "y" and is preceded by a vowel, add "s"
The list is just a [JSON file](irregular-plurals.json) and can be used wherever.
## Install
```
$ npm install irregular-plurals
```
## Usage
```js
const irregularPlurals = require('irregular-plurals');
console.log(irregularPlurals['cactus']);
//=> 'cacti'
console.log(irregularPlurals);
/*
{
addendum: 'addenda',
alga: 'algae',
…
}
*/
```
## Related
- [plur](https://github.com/sindresorhus/plur) - Pluralize a word
## License
MIT © [Sindre Sorhus](https://sindresorhus.com)
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