Best js string builder (v11)

Revision 11 of this benchmark created on

Description

Try to figure out the best way to build strings in javascript.

Preparation HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js">
</script>
<script src="https://ajax.aspnetcdn.com/ajax/jquery.validate/1.9/jquery.validate.min.js">
</script>
<script>
//
// Replace prototype
//
String.prototype.format = function(){
    var args = arguments;
    return this.replace(/\{(\d)\}/g, function(a,b){
        return typeof args[b] != 'undefined' ? args[b] : a;
    });
}

//
// StringBuilder class using join
//

// Initializes a new instance of the StringBuilder class
// and appends the given value if supplied
function StringBuilder(value)
{
    this.strings = new Array("");
    this.append(value);
}

// Appends the given value to the end of this instance.
StringBuilder.prototype.append = function (value)
{
    if (value)
    {
        this.strings.push(value);
    }
}

// Clears the string buffer
StringBuilder.prototype.clear = function ()
{
    this.strings.length = 1;
}

// Converts this instance to a String.
StringBuilder.prototype.toString = function ()
{
    return this.strings.join("");
}
</script>

Setup

window.txt = "<ul><li>{0}</li><li>{1}</li><li>{2}</li></ul>";
    window.t1 = "Lorem ipsum dolor sit amet, consectetuer adipiscing elit.";
    window.t2 = "Aliquam tincidunt mauris eu risus.";
    window.t3 = "Vestibulum auctor dapibus neque.";

Test runner

Ready to run.

Testing in
TestOps/sec
JS normal concat
var testString = "";
for (var i = 0; i <= 10000; i++) {
  testString = testString + "<ul><li>" + window.t1 + "</li>";
  testString = testString + "<li>" + window.t2 + "</li>";
  testString = testString + "<li>" + window.t3 + "</li></ul>";
}
ready
JS replace function
window.res = window.txt.replace('{0}', window.t1).replace('{1}', window.t2).replace('{2}', window.t3);
ready
jquery validate format function
window.res = jQuery.validator.format(window.txt, window.t1, window.t2, window.t3);
ready
String format function
window.res = window.txt.format(window.t1, window.t2, window.t3);
ready
StringBuilder class using 'join'
// create a StringBuilder
var sb = new StringBuilder();

// append the text
for (var i = 0; i <= 10000; i++) {
  sb.append(window.t1);
  sb.append(window.t2);
  sb.append(window.t3);
}
// get the full string value
var s = sb.toString();
ready

Revisions

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