concat vs push.apply

JavaScript performance comparison

Revision 34 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…
shift push
function test() {
  var c = Array.prototype.push.apply(null, arguments);
  while (read = c.shift()) {
    A.push(read);
  }
}

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

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

}
for (i = 0; i < 1000; ++i) {
  test(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
}
pending…
shift calc index no add
function test() {
  var i = A.length;
  while (A[i++] = arguments.shift()) {
    // pass
  }
}

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

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