String concatenation (v48)

Revision 48 of this benchmark created by stringconcat on

Description

Different ways to concatenate strings together

Preparation HTML

<script>
  var str1 = "abcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefga";

  var str2 = "abcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefg";

  var str3 = "abcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefg";

  var str4 = "abcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefg";

  var bigString = "abcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgaabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefgabcdefg"

  var arr = [str1, str2, str3, str4];
</script>

Test runner

Ready to run.

Testing in
TestOps/sec
Direct concatenation
var foo = str1 + str2 + str3 + str4;
ready
Individual += statements
var foo = str1;
foo += str2;
foo += str3;
foo += str4;
ready
Individual statements
var foo = str1;
foo = foo + str2;
foo = foo + str3;
foo = foo + str4;
ready
Using Array#join
var foo = arr.join('');
ready
Single individual statement
var foo = str1;
foo += str2 + str3 + str4;
ready
Function based (for)
function concat(arr) {
  len = arr.length;
  for (s = "", i = 0; i < len; s += arr[i], i++);
  return s;
}

var foo = concat(arr);
ready
concat
var foo = str1;
foo = foo.concat(str2);
foo = foo.concat(str3);
foo = foo.concat(str4);
ready
no concat
var foo = bigString;
ready

Revisions

You can edit these tests or add more tests to this page by appending /edit to the URL.