如果PHP的内置函数都不够好，那凭什么要求我做得更好XD。

头回见原来三元表达式可以这么用

it's already "return", needn't "break".

What a TDD :)

what a ”multiply one more time“.(doge

awesome.while len(arr) == 1 , it will calculate normally to be 0.

resolve katas sometime like translation.your answer deserve “信，雅，达。”

you are the master!

awesome!but (d=='L') will be more readable.

Have the same in dart (, in 'add' we meet 'd' two times so the output must be 1 (isn't?)

Agree, absolutely appalling description.

exactly, man. I've just wasted 15 minutes trying to write a comparator, but after a few attempts with randomized string without any connection to heads, tails, and bodies, the insight descended on me :)))))

this kata is not about coding, it's math.

what's your theory？

you are the best answer