24 lines
735 B
Markdown
24 lines
735 B
Markdown
---
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title: fromCamelCase
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tags: string,intermediate
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---
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Converts a string from camelcase.
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- Use `String.prototype.replace()` to remove underscores, hyphens, and spaces and convert words to camelcase.
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- Omit the second argument to use a default `separator` of `_`.
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```js
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const fromCamelCase = (str, separator = '_') =>
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str
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.replace(/([a-z\d])([A-Z])/g, '$1' + separator + '$2')
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.replace(/([A-Z]+)([A-Z][a-z\d]+)/g, '$1' + separator + '$2')
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.toLowerCase();
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```
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```js
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fromCamelCase('someDatabaseFieldName', ' '); // 'some database field name'
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fromCamelCase('someLabelThatNeedsToBeCamelized', '-'); // 'some-label-that-needs-to-be-camelized'
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fromCamelCase('someJavascriptProperty', '_'); // 'some_javascript_property'
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```
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