Details on rounding are not specified w.r.t. breaking ties, and possibly differ between languages.

Updating tests for Crystal was tricky because default rounding mode for round changed from half-up to half-even, and fixed tests expected values different than returned by reference solution.

The final test should have fixed tests

JS :

• assertSimilar makes the output harder to parse vs the alternatives
• there is no reason not to precode a complicated return object just like you preload dict's

JS :

• rounding doesn't solve float errors, you can still be off by +/- 0.001 in the final result and have to submit a few times
• don't round -OR- intelligently allow for rounded comparisons

JS :

• no example calculation

When you are using concepts which are not trivially known, like unit conversions, m/micro prefixes, it is really necessary to give a calculation unless you want the kata to be about figuring all of that out vs coding (most people won't hence the likely few solutions).

Python, Ruby and Crystal translations kumited, cheers :)

Thanks for translating @donaldsebleung

I think you misread the description. It clearly states to round to the nearest 10 when the result is odd. Since anything to the power of 0 is 1 (which is odd), it is rounded down to 0.

PHP Translation Kumited - please accept :D