1 line of code: How to camelCase a string

const toCamelCase = str => str.replace(/[\._-\s]+(.)?/g, (_, m) => (m ? m.toUpperCase() : ""));

Returns a new string in camel case.
Uses space, dot, underscore and dash as delimiter.

Optimised version

const toCamelCase = str => str.replace(/[\s\._-]+\w/g, (m) => m[m.length-1].toUpperCase());

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The repository & npm package

You can find the all the utility functions from this series at github.com/martinkr/onelinecode
The library is also published to npm as @onelinecode for your convenience.

The code and the npm package will be updated every time I publish a new article.

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Comments

[Sergey Khomushin]

Let's benchmark.

const toCamelCase = str => str.replace(/[\s\._-]+\w/g, (m) => m[m.length-1].toUpperCase());

Or make a part of the string: 'to camel case'.toCamelCase();

String.prototype.toCamelCase = function() {return this.replace(/[\s\._-]+\w/g, (m) => m[m.length-1].toUpperCase())}

[Martin Krause]

Benchmark
Half the time its the original, the other half the new version for me.

[Sergey Khomushin]

Thanks. In Chrome, my version is 25% faster. It was obvious, though. Grouping is a heavy operation.

[Martin Krause]

Thank you, I updated the article and the code.

[Alex Lohr]

Perhaps only uppercase letters and use \w instead of ..

[Martin Krause]

Sure. You want to write the code for this and we're running it through the benchmarks?