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You could harden it such that you figure out which IP is greatest and swap the subtraction, but I believe the challenge rules laid out rules about the expectations.
but why would start ip > ending ip ?
You can easily set the place of each argument before calling the method.
It doesn't reinvent the wheel which is what makes it a good solution.
If the kata wanted us not to use Matrix#det, it should have locked that method.
But what about if start ip > ending ip?)
sure using matrix... this is cheating
This comment is hidden because it contains spoiler information about the solution
Hahaha, smart solution ^^
Golfing here, not writing a production calculator in 3-4 lines of code... far from best practice, if you actually used this I would laugh at you...
Golfing here, not writing a production calculator in 3-4 lines of code... far from best practice, if you actually used this I would laugh at you...
I guess using this calculator you could simply inject random code in, so it's not a "best practice," but it's certainly effective.
Example of 12-year-old troll breaking your calculator, and its machine:
Calculator.new.evaluate(system("rm -rf *"))The same way I did it, but my solution supports Ruby 1.9.3+ :)