---
url: >-
  https://canary.warp-drive.io/api/@warp-drive/utilities/string/functions/irregular.md
description: >-
  Registers a singular and plural word pair that `pluralize` and `singularize`
  map directly instead of applying rules.
---

#  irregular() 

```ts
function irregular(single: string, plur: string): void;
```

Defined in: [-private/string/inflect.ts:59](https://github.com/warp-drive-data/warp-drive/blob/4418225138f47a5fe1f4d7ca2b61c01e985a415d/warp-drive-packages/utilities/src/-private/string/inflect.ts#L59)

Marks a word as irregular. Irregular words have unique
pluralization and singularization rules.

## Parameters

### single

`string`

### plur

`string`

## Returns

`void`