There are a lot of kata on codewars that are terrible.
8 kyu is the easiest and 1kyu is the hardest.
Here is a list of some the good ones: (This is not a complete list, and eventually there will be more than one for each level.)
Even or odd
Array#second (ruby)
- Description should be clear.
- Task should be sensible.
- Input data should be in an appropriate format.
- Output data should be in an approprate (consistent) format.
- Tests should be helpful.
- Tests should be complete.
- Should not require manual entry of large arrays/strings.