29 lines
1.3 KiB
Markdown
29 lines
1.3 KiB
Markdown
### pluralize
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Returns the singular or plural form of the word based on the input number. If the first argument is an `object`, it will use a closure by returning a function that can auto-pluralize words that don't simply end in `s` if the supplied dictionary contains the word.
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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 to use the default of the singular word + `s`, or supply a custom pluralized word when necessary. If the first argument is an `object`, utilize a closure by returning a function which can use the supplied dictionary to resolve the correct plural form of the word.
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```js
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const pluralize = (val, word, plural = word + 's') => {
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const _pluralize = (num, word, plural = word + 's') =>
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[1, -1].includes(Number(num)) ? word : plural;
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if (typeof val === 'object') return (num, word) => _pluralize(num, word, val[word]);
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return _pluralize(val, word, plural);
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};
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```
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```js
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pluralize(0, 'apple'); // 'apples'
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pluralize(1, 'apple'); // 'apple'
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pluralize(2, 'apple'); // 'apples'
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pluralize(2, 'person', 'people'); // 'people'
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const PLURALS = {
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person: 'people',
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radius: 'radii'
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};
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const autoPluralize = pluralize(PLURALS);
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autoPluralize(2, 'person'); // 'people'
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```
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