join/concat (v28)

Revision 28 of this benchmark created by Lodewijk Andre de la Porte on

Description

A simpler check for testing for concat vs join outside of a loop (not building a string in a loop, typical use case would be to use a var in the string).

Preparation HTML

<script>
  var str = 'string';
  var barr = ['this', ' is', ' a', str, ' to', ' test', ' if', ' there', ' is', ' any', ' difference', ' between', ' concat', ' and', ' join'];
  var sarr = ['this', ' is', ' a', str];
</script>

Test runner

Ready to run.

Testing in
TestOps/sec
concat
var a = 'this' + ' is' + ' a' + str + ' to' + ' test' + ' if' + ' there' + ' is' + ' any' + ' difference' + ' between' + ' concat' + ' and' + ' join';
ready
join
var a = barr.join('');
ready
concat shorter
var a = 'this' + ' is' + ' a' + str;
ready
join shorter
var a = sarr.join('');
ready
concat in a loop
var str = '';
for (var i = 0; i < barr.length; i++) {
  str += barr[i];
}
ready
join on inline array
['this', ' is', ' a', str, ' to', ' test', ' if', ' there', ' is', ' any', ' difference', ' between', ' concat', ' and', ' join'].join('');
ready
join on inline array shorter
['this', ' is', ' a', str].join('');
ready
join on a Array object
(new Array('this', ' is', ' a', str, ' to', ' test', ' if', ' there', ' is', ' any', ' difference', ' between', ' concat', ' and', ' join')).join("");
ready
concat shorter +=
var a = 'this';
a += ' is';
a += ' a';
a += str;
ready
Join in a Loop
var strArr = [];
for (var i = 0; i < barr.length; i++) {
  strArr.push(barr[i]);
}
var result = strArr.join();
ready
+= and for x in loop
out = '';
for (i = 0; i < barr.length; i++) {
  out += barr[i];
}
return out;
ready

Revisions

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