Pin It Down

A vague request produces coherent code that solves a slightly different problem. These exercises give you the prose and ask for the cases that make it unambiguous — graded by whether they reject the implementations that are subtly wrong.

Pin it down: the cases that make a classnames helper unambiguous

intermediatechallenge

Five implementations of cn(). One is right and four skip a sentence each — and every one of them handles cn('btn', 'active') perfectly. Write the cases that tell them apart.