Very funny Kata ... if you choose the right path!

Would be nice to generalize it to an larin alphabet and write ... words!

Thanks you to the author!

Adding lore does not make this not an duplicate. What you're doing is just putting a thin layer of disguise trying to fool inexperienced people.

If we'd allow this to past everyone would be shitposting yet another fizzbuzz/fibonacci in no time.

Not a very original Kata IMO - see the link I referenced in my submitted solution regarding "Trivial BF substitution" which makes this Kata a rather close duplicate to My smallest code interpreter (aka Brainf**k). Perhaps you could rework the Kata to require the solver to implement a general "Trivial BF substitution" interpreter which allows the solver to interpret any program under this category (given the substitution commands)? Something like trivialBFSubstitution(a, b, c, d, e, f, g, h)(substitutionDependentHelloWorldProgram, ""); // => "Hello World!". Cheers :)

Needs Random Tests.

Just as mentioned below, this is nothing new at all.

Please publish something actually original, and not yet another amalgam of the hundreds of tasks already done to death in the approved white katas.

This kata should have tests that include values like floats and negative numbers. Then again, this is essentially a duplicate if the task is to sum up numbers in an array.