Array Join vs String Concat

Question

Which method is faster?

Array Join:

var str_to_split = "a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z";
var myarray = str_to_split.split(",");

var output=myarray.join("");

---

String Concat:

var str_to_split = "a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z";
var myarray = str_to_split.split(",");

var output = "";
for (var i = 0, len = myarray.length; i<len; i++){
    output += myarray[i];
}

Answer 1

String concatenation is faster in ECMAScript. Here's a benchmark I created to show you:

http://jsben.ch/#/OJ3vo