30 lines
921 B
Markdown
30 lines
921 B
Markdown
---
|
|
title: String from camelcase
|
|
tags: string
|
|
expertise: intermediate
|
|
cover: blog_images/mountain-lake-cottage.jpg
|
|
firstSeen: 2017-12-17T17:55:51+02:00
|
|
lastUpdated: 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'
|
|
```
|