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javascript/snippets/capitalize.md

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