25 lines
759 B
Markdown
25 lines
759 B
Markdown
---
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title: Capitalize string
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tags: string
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cover: digital-nomad-3
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firstSeen: 2017-12-17T16:41:31+02:00
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lastUpdated: 2020-11-01T20:50:57+02:00
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---
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Capitalizes the first letter of a string.
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- Use array destructuring and `String.prototype.toUpperCase()` to capitalize the first letter of the string.
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- Use `Array.prototype.join()` to combine the capitalized `first` with the `...rest` of the characters.
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- Omit the `lowerRest` argument to keep the rest of the string intact, or set it to `true` to convert to lowercase.
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```js
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const capitalize = ([first, ...rest], lowerRest = false) =>
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first.toUpperCase() +
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(lowerRest ? rest.join('').toLowerCase() : rest.join(''));
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```
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```js
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capitalize('fooBar'); // 'FooBar'
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capitalize('fooBar', true); // 'Foobar'
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```
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