Swift solution :
func dnaStand(dna: String) -> String { let dnaMatching: [Character:Character] = ["A":"T","T":"A","C":"G","G":"C"] return dna.reduce(into: "") { $0.append(dnaMatching[$1] ?? "" as! Character) } } dnaStand(dna:"ATTGC") dnaStand(dna:"GTTAAC") dnaStand(dna:"AAAA") dnaStand(dna:"CTACC") dnaStand(dna:"GTAT")
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Swift solution :