Thanks for this kata — I really enjoyed how it encourages thinking in two representations at once. Converting between binary and decimal here feels very natural, and the problem stays clean without adding unnecessary complexity.

I especially liked how the operation choice pushes you to keep the solution readable rather than clever-for-the-sake-of-it. It’s a great example of a kata that rewards clarity and correctness, and it fits perfectly as a practice exercise for understanding number systems and control flow together. Well designed and fun to solve — thanks for sharing it!

Java translation
https://www.codewars.com/kumite/6919a473af18de67f9a65303?sel=6919a473af18de67f9a65303

Description SVG should be inlined.

Enabled in this fork

Fixed in this fork

YOU could always do System.out.println, but here you go ~~

BinaryCalculator.calculate("10", "100", "subtract");

Enabled in this fork

The kata lacks a description about the order of the duplicates, I guess it's more challenging figuring it out by oneself however it should be specified.

Approved

python new test framework is required. updated in this fork

Finding Secret Messages

kata description

didn't work - Expected: 'there was never a secret message', instead got: 'there was never a secret'
Completed in 1ms
random test

Test for no duplicates - Expected: '', instead got: 'uqzh fnbu sxgkig leqs sctiitd sacwgv bmynt kzfp ubythv rqukeu yhgtmol jgdyikq fmzkct rsdjm aosni kqpy mwgkp hyfyfii wfudp adzb gblc whlst cyxvg daxnwuf jydyqov zygnq sjmwl elie xzjhrh kygt vjryy rhyciqf xgpo qanvkk lhipv xnvvt prtn zupvnhh ytdez ablhin. cdwtitd cxkz nxzeb kauabqb kbckv wezb nmcljo skdp kiyptr kjcj pzmiygk uqgbl vapdvjj jnuirk jczrq mcpnoed kshw lnqq xike dhgq. rucnw jkooe ddnhc eggt eqpnui buaezrq jrqk dmuyio oavjwp ursae hfcs vitugv qsvnnyq ysxvw vjdvja pvugcu zkvqunn vzpkd ajcxn wytuisw.'

randomly injected duplicates - Expected: 'slgj tthy qnxjbma miszch geyru pfgbt zjhvaz bswev jkeaj yronyn', instead got: 'slgj qnxjbma miszch geyru pfgbt zjhvaz bswev jkeaj yronyn'

Don't this problems in console browser. Why?

Ruby 3.0 should be enabled.

Ruby 3.0 should be enabled.

Ruby 3.0 should be enabled.