USE RUBY PROGRAMMING LANGUAGE

The reverse-complement of a DNA string is a new string in which each nucleotide is replaced by its complement and the string is reversed. Reverse-complements are important in bioinformatics since a strand of DNA can be read in forward direction or, equivalently, its complementary strand can be read in its forward direction, which is reverse of the original strings direction. Add the reverse_complement method to your DNA class. In response to reverse_complement, it returns a new DNA instance representing its reverse-complement. Note also that a == b if and only if DNA instances a and b represent the same DNA strand.

>> dna1 = DNA.new('ATTGCC')

=> ATTGCC

>> dna2 = dna1.reverse_complement

=> GGCAAT

>> dna2

=> GGCAAT

>> dna1

=> ATTGCC

>> dna2.reverse_complement

=> ATTGCC

>> dna1.reverse_complement.reverse_complement == dna1

=> true