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javascript/snippets/pluralize.md

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+---
+title: Pluralize string
+type: snippet
+tags: [string]
+cover: shell-focus
+dateModified: 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'
+```