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javascript/snippets/from-camel-case.md

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+---
+title: String from camelcase
+type: snippet
+tags: [string]
+cover: mountain-lake-cottage
+dateModified: 2020-10-22T20:23:47+03:00
+---
+
+Converts a string from camelcase.
+
+- Use `String.prototype.replace()` to break the string into words and add a `separator` between them.
+- Omit the second argument to use a default `separator` of `_`.
+
+```js
+const fromCamelCase = (str, separator = '_') =>
+  str
+    .replace(/([a-z\d])([A-Z])/g, '$1' + separator + '$2')
+    .replace(/([A-Z]+)([A-Z][a-z\d]+)/g, '$1' + separator + '$2')
+    .toLowerCase();
+```
+
+```js
+fromCamelCase('someDatabaseFieldName', ' '); // 'some database field name'
+fromCamelCase('someLabelThatNeedsToBeDecamelized', '-');
+// 'some-label-that-needs-to-be-decamelized'
+fromCamelCase('someJavascriptProperty', '_'); // 'some_javascript_property'
+fromCamelCase('JSONToCSV', '.'); // 'json.to.csv'
+```