Benchmark: Javascript 'concat()' vs '+' for strings

Script Preparation code:

var string1 = "Hello ";
var string2 = " world!";

Tests:

concat()
for(i = 0; i < 1000; i++) { var message = string1.concat(string2); }
plus_operator
for(i = 0; i < 1000; i++) { var message = string1 + string2; }
plus_eq_operator
for(i = 0; i < 1000; i++) { var message += string1 + string2; }

Rendered benchmark preparation results:

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Javascript 'concat()' vs '+' for strings (version: 0)