Deoxyribonucleic acid, DNA is the primary information storage
	 molecule in biological systems. It is composed of four nucleic 
	 acid bases Guanine ('G'), Cytosine ('C'), Adenine ('A'), and 
	 Thymine ('T').

	Ribonucleic acid, RNA, is the primary messenger molecule in 
	cells. RNA differs slightly from DNA its chemical structure 
	and contains no Thymine. In RNA Thymine is replaced by another 
	nucleic acid Uracil ('U').
	
	Create a function which translates a given DNA string into RNA.
	
	The input string can be of arbitrary length - in particular, 
	it may be empty. All input is guaranteed to be valid, i.e. 
	each input string will only ever consist of 'G', 'C', 'A' 
	and/or 'T'.

	For example:
				

	"GCAT"  =>  "GCAU"
				

Solution by -

	function DNAtoRNA(dna) {
		return dna.replace(/[T]/ig,'U')
		}
				

Try it yourself - CodeWars

	Deoxyribonucleic acid, DNA is the primary information storage
	 molecule in biological systems. It is composed of four nucleic 
	 acid bases Guanine ('G'), Cytosine ('C'), Adenine ('A'), and 
	 Thymine ('T').

	Ribonucleic acid, RNA, is the primary messenger molecule in 
	cells. RNA differs slightly from DNA its chemical structure 
	and contains no Thymine. In RNA Thymine is replaced by another 
	nucleic acid Uracil ('U').
	
	Create a function which translates a given DNA string into RNA.
	
	The input string can be of arbitrary length - in particular, 
	it may be empty. All input is guaranteed to be valid, i.e. 
	each input string will only ever consist of 'G', 'C', 'A' 
	and/or 'T'.

	For example:
				

	"GCAT"  =>  "GCAU"
				

Solution by -

	function DNAtoRNA(dna) {
		return dna.replace(/[T]/ig,'U')
		}
				

Try it yourself - CodeWars