cannot be changed anymore

right? i test it too. it not work with last test

Doesn't work for:
$this->assertEquals([], solution(""));

strlen counts ç,ş,ü,ğ as 2. so its better to use mb_strlen or convert it to an array then count.

Hi, as was mentioned in task description, we need iterate until Math::PI - our_calculated > epsilon. You may, possible getting your iterations count by some manipulations with epsilon itself - e.g. take reverse number of it, or so on.

You can use:
(r * 1e10).round / 1e10
where r is your result with all its decimals (as long as r is correct...).

Hi,

I tried to solve this kata in Crystal. Unfortunately I have two issues:

1. using the round 10 doesn't work as expected. All 16 decimals are returned then:
   expected: [10, 3.0418396189]
   got: [10, 3.0418396186909367]
   on the other hand using round 9 returns a value as expected:
   expected: [10, 3.0418396189]
   got: [10, 3.041839619]
   It's just my third kata in Crystal, so I don't know if I'm doing something wrong or it's just a bug in Crystal
2. Even if rounding up to ten decimals would work as expected (for me) there is still a difference. Maybe it's due to floating point precision stuff ...?
   a) first test
   expected: [10, 3.0418396189]
   got: [10, 3.0418396186909367]
   b) second test
   expected: [100, 3.1315929036]
   got: [100, 3.1315929033839542]
   c) thrid test
   expected: [1000, 3.1405926538]
   got: [1000, 3.1405926539827576]
   d) fourth test
   expected: [10000, 3.1414926536]
   got: [10000, 3.1414926533677505]

Any ideas?

Thanks in advance

I liked this one as well. Interesting how everyone has solved it so far.

I agree with comments of Joshua B. Should be a higher grade Kata.

Definitely agree, spot on with your comments.

I was wondering if a 7th kyu grade is skilled enough to solve this kata this way, as it is a beginner's grade.
My expectation has been (from a java point of view):
8th kyu -> brute force solution with simple type int
7th kyu -> brute force solution with BigInteger (for I have to use the object's methods and constants)
6th kyu -> performing a bit-wise operation for enhancement

What do you think?

Why not adding a link to mathworld ( http://mathworld.wolfram.com/Determinant.html ) inside the kata description for some theory background about determinants?

Ah, I see. No problem, just would've been nice...err naughty...nevermind ;-)

Once a kata has 500 completions it becomes locked from edits.