31 lines
971 B
Markdown
31 lines
971 B
Markdown
---
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title: toSnakeCase
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tags: string,regexp,intermediate
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firstSeen: 2017-12-22T18:13:22+02:00
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lastUpdated: 2021-06-28T15:27:44+03:00
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---
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Converts a string to snake case.
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- Use `String.prototype.match()` to break the string into words using an appropriate regexp.
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- Use `Array.prototype.map()`, `Array.prototype.slice()`, `Array.prototype.join()` and `String.prototype.toLowerCase()` to combine them, adding `_` as a separator.
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```js
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const toSnakeCase = str =>
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str &&
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str
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.match(/[A-Z]{2,}(?=[A-Z][a-z]+[0-9]*|\b)|[A-Z]?[a-z]+[0-9]*|[A-Z]|[0-9]+/g)
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.map(x => x.toLowerCase())
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.join('_');
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```
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```js
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toSnakeCase('camelCase'); // 'camel_case'
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toSnakeCase('some text'); // 'some_text'
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toSnakeCase('some-mixed_string With spaces_underscores-and-hyphens');
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// 'some_mixed_string_with_spaces_underscores_and_hyphens'
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toSnakeCase('AllThe-small Things'); // 'all_the_small_things'
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toSnakeCase('IAmEditingSomeXMLAndHTML');
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// 'i_am_editing_some_xml_and_html'
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```
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