I think he's referring to the {} after #map.

Mine is basically the same as this one (mine has a ternary operator in the block) and this has lots of upvotes. It makes me feel I am progressing in my Ruby skills now :)

Look simple, i like this one.

great solution. would you by anychance know a good website that explains blocks in details? Cause honestly, without the description of the kata I wouldn't understand what you did.

thanks

@p7r But it's also more optimized. O(n) vs. O(n^2).