39 lines
1.3 KiB
Markdown
39 lines
1.3 KiB
Markdown
---
|
|
title: pluralize
|
|
tags: string,advanced
|
|
firstSeen: 2018-01-03T13:17:19+02:00
|
|
lastUpdated: 2020-10-22T20:24:04+03:00
|
|
---
|
|
|
|
Returns the singular or plural form of the word based on the input number, using an optional dictionary if supplied.
|
|
|
|
- Use a closure to define a function that pluralizes the given `word` based on the value of `num`.
|
|
- If `num` is either `-1` or `1`, return the singular form of the word.
|
|
- If `num` is any other number, return the `plural` form.
|
|
- Omit the third argument, `plural`, to use the default of the singular word + `s`, or supply a custom pluralized `word` when necessary.
|
|
- If the first argument is an `object`, return a function which can use the supplied dictionary to resolve the correct plural form of the word.
|
|
|
|
```js
|
|
const pluralize = (val, word, plural = word + 's') => {
|
|
const _pluralize = (num, word, plural = word + 's') =>
|
|
[1, -1].includes(Number(num)) ? word : plural;
|
|
if (typeof val === 'object')
|
|
return (num, word) => _pluralize(num, word, val[word]);
|
|
return _pluralize(val, word, plural);
|
|
};
|
|
```
|
|
|
|
```js
|
|
pluralize(0, 'apple'); // 'apples'
|
|
pluralize(1, 'apple'); // 'apple'
|
|
pluralize(2, 'apple'); // 'apples'
|
|
pluralize(2, 'person', 'people'); // 'people'
|
|
|
|
const PLURALS = {
|
|
person: 'people',
|
|
radius: 'radii'
|
|
};
|
|
const autoPluralize = pluralize(PLURALS);
|
|
autoPluralize(2, 'person'); // 'people'
|
|
```
|