20 lines
664 B
Markdown
20 lines
664 B
Markdown
---
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title: decapitalize
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tags: string,intermediate
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---
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Decapitalizes the first letter of a string.
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- Use array destructuring and `String.toLowerCase()` to decapitalize first letter, `...rest` to get array of characters after first letter and then `Array.prototype.join('')` to make it a string again.
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- Omit the `upperRest` parameter to keep the rest of the string intact, or set it to `true` to convert to uppercase.
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```js
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const decapitalize = ([first, ...rest], upperRest = false) =>
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first.toLowerCase() + (upperRest ? rest.join('').toUpperCase() : rest.join(''));
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```
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```js
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decapitalize('FooBar'); // 'fooBar'
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decapitalize('FooBar', true); // 'fOOBAR'
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```
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