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

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+---
+title: Snakecase string
+type: snippet
+language: javascript
+tags: [string,regexp]
+cover: rustic-cup
+dateModified: 2021-06-28T15:27:44+03:00
+---
+
+Converts a string to snake case.
+
+- Use `String.prototype.match()` to break the string into words using an appropriate regexp.
+- Use `Array.prototype.map()`, `Array.prototype.slice()`, `Array.prototype.join()` and `String.prototype.toLowerCase()` to combine them, adding `_` as a separator.
+
+```js
+const toSnakeCase = str =>
+  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.toLowerCase())
+    .join('_');
+```
+
+```js
+toSnakeCase('camelCase'); // 'camel_case'
+toSnakeCase('some text'); // 'some_text'
+toSnakeCase('some-mixed_string With spaces_underscores-and-hyphens');
+// 'some_mixed_string_with_spaces_underscores_and_hyphens'
+toSnakeCase('AllThe-small Things'); // 'all_the_small_things'
+toSnakeCase('IAmEditingSomeXMLAndHTML');
+// 'i_am_editing_some_xml_and_html'
+```