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snippets/js/s/to-camel-case.md

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+---
+title: Camelcase string
+type: snippet
+language: javascript
+tags: [string,regexp]
+cover: meteora
+dateModified: 2020-10-22T20:24:30+03:00
+---
+
+Converts a string to camelcase.
+
+- Use `String.prototype.match()` to break the string into words using an appropriate regexp.
+- Use `Array.prototype.map()`, `Array.prototype.slice()`, `Array.prototype.join()`, `String.prototype.toLowerCase()` and `String.prototype.toUpperCase()` to combine them, capitalizing the first letter of each one.
+
+```js
+const toCamelCase = str => {
+  const s =
+    str &&
+    str
+      .match(
+        /[A-Z]{2,}(?=[A-Z][a-z]+[0-9]*|\b)|[A-Z]?[a-z]+[0-9]*|[A-Z]|[0-9]+/g
+      )
+      .map(x => x.slice(0, 1).toUpperCase() + x.slice(1).toLowerCase())
+      .join('');
+  return s.slice(0, 1).toLowerCase() + s.slice(1);
+};
+```
+
+```js
+toCamelCase('some_database_field_name'); // 'someDatabaseFieldName'
+toCamelCase('Some label that needs to be camelized');
+// 'someLabelThatNeedsToBeCamelized'
+toCamelCase('some-javascript-property'); // 'someJavascriptProperty'
+toCamelCase('some-mixed_string with spaces_underscores-and-hyphens');
+// 'someMixedStringWithSpacesUnderscoresAndHyphens'
+```