concat vs push.apply

JavaScript performance comparison

Revision 30 of this test case created

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var  A = [];
   
    for (var i = 0; i < 42; ++i) {
      A[i] = {};
    }
    var b = [1,2,3,4,5,6,7,8,9,10];
    var read;
};

Benchmark.prototype.teardown = function() {
    b = [{},{},{},{},{},{},{},{},{},{}];
};
</script>

Test runner

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Testing in unknown unknown
Test Ops/sec
concat
function test() {
 A = A.concat(arguments);
}

for (i = 0; i < 1000; ++i) {
  test(1,2,3,4,5,6,7,8,9,10);
}
pending…
push.apply
function test() {
 A.push.apply(A, arguments);
}

for (i = 0; i < 1000; ++i) {
  test(1,2,3,4,5,6,7,8,9,10);
}
pending…
Array.prototype.push.apply
function test() {
 Array.prototype.push.apply(A, arguments);
}

for (i = 0; i < 1000; ++i) {
  test(1,2,3,4,5,6,7,8,9,10);
}
pending…
Array.prototype.push cached
var cachedPush = Array.prototype.push;

function test() {
 cachedPush.apply(A, arguments);
}

for (i = 0; i < 1000; ++i) {
  test(1,2,3,4,5,6,7,8,9,10);
}
pending…
shift push
var c = b.slice();
while(read = c.shift()){
 A.push(read);
 
}
pending…
shift calc index
var i = 0;
while(read = b.shift()){
 A[A.length+i++] = read;
}
pending…
read into
var i = 0;
while (read = b[i++]) {
A.push(read)
}
pending…

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