30 lines
1.1 KiB
Markdown
30 lines
1.1 KiB
Markdown
---
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title: Pascalcase string
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tags: string,regexp
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expertise: intermediate
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cover: blog_images/camera-zoom.jpg
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firstSeen: 2021-09-08T19:21:13+00:00
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---
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Converts a string to pascal 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()`, `String.prototype.toUpperCase()` and `String.prototype.toLowerCase()` to combine them, capitalizing the first letter of each word and lowercasing the rest.
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```js
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const toPascalCase = 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.charAt(0).toUpperCase() + x.slice(1).toLowerCase())
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.join('');
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```
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```js
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toPascalCase('some_database_field_name'); // 'SomeDatabaseFieldName'
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toPascalCase('Some label that needs to be pascalized');
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// 'SomeLabelThatNeedsToBePascalized'
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toPascalCase('some-javascript-property'); // 'SomeJavascriptProperty'
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toPascalCase('some-mixed_string with spaces_underscores-and-hyphens');
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// 'SomeMixedStringWithSpacesUnderscoresAndHyphens'
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```
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