Append string vs join array

JavaScript performance comparison

Revision 16 of this test case created

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var i = 0, str = '', arr = [],
    w1 = 'brown', w2 = 'jumped', w3 = 'lazy';
};
</script>

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Testing in unknown unknown
Test Ops/sec
String append #1
str += 'Quick ' + w1 + ' fox ' + w2 + ' over the ' + w3 + ' dog. ';
pending…
String append #2
str += 'Quick ';
str += w1;
str += ' fox ';
str += w2;
str += ' over the ';
str += w3;
str += ' dog. ';
pending…
Array join #2
arr[i++] = 'Quick ' + w1 + ' fox ' + w2 + ' over the ' + w3 + ' dog. ';
arr.join('');
pending…
Array join #2
arr[i++] = 'Quick ';
arr[i++] = w1;
arr[i++] = ' fox ';
arr[i++] = w2;
arr[i++] = ' over the ';
arr[i++] = w3;
arr[i++] = ' dog. ';
o = arr.join('');
pending…
Array join #3
arr[i++] = 'Quick ';
arr[i++] = w1;
arr[i++] = ' fox ';
arr[i++] = w2;
arr[i++] = ' over the ';
arr[i++] = w3;
arr[i++] = ' dog. ';
var o = '';
for (var j = 0, k = arr.length; j<k; j++)
    o += arr[j];
pending…

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