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Completed at: 2023-10-25T04:36:44.153Z
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Completed languages: java
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Tags: Strings, Fundamentals
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Rank: 7 kyu
Deoxyribonucleic acid (DNA) is a chemical found in the nucleus of cells and carries the "instructions" for the development and functioning of living organisms.
If you want to know more: http://en.wikipedia.org/wiki/DNA
In DNA strings, symbols "A" and "T" are complements of each other, as "C" and "G". Your function receives one side of the DNA (string, except for Haskell); you need to return the other complementary side. DNA strand is never empty or there is no DNA at all (again, except for Haskell).
More similar exercise are found here: http://rosalind.info/problems/list-view/ (source)
Example: (input --> output)
```
"ATTGC" --> "TAACG"
"GTAT" --> "CATA"
```
dnaStrand [] `shouldBe` []
dnaStrand [A,T,G,C] `shouldBe` [T,A,C,G]
dnaStrand [G,T,A,T] `shouldBe` [C,A,T,A]
dnaStrand [A,A,A,A] `shouldBe` [T,T,T,T]