You can loop through an array of items and recursively add them to a string variable, for instance if you wanted a random DNA sequence:

function randomDNA(len) { len = len || 100 var nuc = new Array("A", "T", "C", "G") var i = 0 var n = 0 s = '' while (i<=len-1) { n = Math.floor(Math.random()*4) s+= nuc[n] i++ } return s } 

You can loop through an array of items and recursively add them to a string variable, for instance if you wanted a random DNA sequence:

function randomDNA(len) { len = len || 100 var nuc = new Array("A", "T", "C", "G") var i = 0 var n = 0 s = '' while (i <= len - 1) { n = Math.floor(Math.random() * 4) s += nuc[n] i++ } return s } console.log(randomDNA(5));