A fast homogenous JavaScript array generator. Given some string, it generates an array of arbitrary length containing that string repeated. It uses binary concatenation and string addition to achieve its speed.

fastArray.js

var generateArray=function(x,n)
{
    var s,y,z;
    s="";
    if(x.length>1)
    {
        s="|";
    }
    x+=s;
    y="";
    while(n>0)
    {
        if(n%2)
        {
            y+=x;
            n--;
        }
        if(n!==0)
        {
            x+=x;
            n/=2;
        }
    }
    y=y.split(s);
    y.pop();
    return y;
};


generateArray("abc",5);
// returns ["abc","abc","abc","abc","abc"].

generateArray("x",1594323);
// Takes just 75ms.

generateArray("xyz",1594323);
// Takes just 185ms.