Level 3: Strings and dates · Exercise 43 of 76 · Free

Convert to camelCase

A JavaScript exercise from Scriptdrill. Solve it with a code editor in your browser that runs your function against example and hidden tests, and it is checked the moment you submit.

The task

Convert `s` to camelCase. Words are separated by spaces, hyphens or underscores, possibly several in a row, and separators at the start or end are ignored. The first word is all lowercase; every later word gets an uppercase first letter and a lowercase rest, so `"API_KEY"` becomes `"apiKey"` and `"get HTTP response"` becomes `"getHttpResponse"`. An empty string returns `""`.

What this exercise teaches

Splitting on a run of separators and filtering empty strings handles repeated and leading separators in one step. Lowercasing each word before capitalizing is what turns API into Api; only capitalizing the first letter leaves KEY as KEY.

A hint if you get stuck

Split on `/[\s_-]+/`, drop empty words, lowercase every word, then uppercase the first letter of every word except the first and join.