Kata like this is a duplicate to many existing katas nowadays.

Do not use leading zeros so [1,2,3,0,2,3] should return 2: 123 - 0 - 23 and 123 + 0 - 23 but NOT 123 - 023.

Random tests never randomize 0, so this case is not tested. My solution hardcodes one fixed variant and does not care about leading zeros and still passes.

What's the maximum lenght of the input array? Is there a limit on it?

• Suspiciously similar to existing katas, but rather not strictly a duplicate.
• Wouldn't it be nice to forbid eval right away and just accept 'proper' calculations?
• Is it allowed to reorder array elements?
• Is it allowed to merge more than two consecutive numbers? Is it allowed to merge leading zeros? Is following a correct combination: ([1,2,3,0,2,3], 100) => 123-023=100?

This kata needs random tests ;-)