33 lines
1.0 KiB
Markdown
33 lines
1.0 KiB
Markdown
---
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title: toCamelCase
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tags: string,regexp,intermediate
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---
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Converts a string to camelcase.
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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.toLowerCase()` and `String.prototype.toUpperCase()` to combine them, capitalizing the first letter of each one.
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```js
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const toCamelCase = str => {
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let s =
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str &&
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str
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.match(
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/[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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)
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.map(x => x.slice(0, 1).toUpperCase() + x.slice(1).toLowerCase())
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.join('');
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return s.slice(0, 1).toLowerCase() + s.slice(1);
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};
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```
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```js
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toCamelCase('some_database_field_name'); // 'someDatabaseFieldName'
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toCamelCase('Some label that needs to be camelized');
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// 'someLabelThatNeedsToBeCamelized'
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toCamelCase('some-javascript-property'); // 'someJavascriptProperty'
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toCamelCase('some-mixed_string with spaces_underscores-and-hyphens');
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// 'someMixedStringWithSpacesUnderscoresAndHyphens'
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```
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