yet another join vs concat

JavaScript performance comparison

Test case created by Jesse


testing another join vs concat to see which is faster.

Preparation code

Benchmark.prototype.setup = function() {
    var a = "a",
        b = "b",
        c = "c",
        d = "d",
        e = "e",
        f = "f";

Test runner

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Testing in unknown unknown
Test Ops/sec
concat inline HTML
var htmlString = "<p>" + a + "</p><p>" + b + "</p><p>" + c + "</p><p>" + d + "</p><p>" + e + "</p><p>" + f + "</p>";

return htmlString
join inline HTML
var htmlString = ["<p>", a, "</p><p>", b, "</p><p>", c, "</p><p>", d, "</p><p>", e, "</p><p>", f, "</p>"];

return htmlString.join('');

Compare results of other browsers


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1 comment

Jesse (revision owner) commented :

it looks like straight up concatination is faster in all browsers, I tested each version minus safari. I'm tyring to figure out why joining an array of strings is often recommended as best practice on some websites.

Anyone can weigh in on this?

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