This is something that really got me thinking about how to make my own prettier from scratch because I thought it was interesting. Needless to say, having looked at the “tests” for prettier I was kind of lost because I was trying to reverse engineer from the tests. What I saw was the format tests are auto generated and have if statements in them. If you’re a unit test stickler then seeing an if statement in a test should be a smell. The hardest part was trying to get the why behind each test. No explanation is in the test but I’ll bet it’s in the docs, source code or whatever cloud chat community.

Also, I had to check the winning implementation just for sanity’s sake. It is older than a week or two. Still, my hats off to them for being able to meet the compatibility mark and get the cash.