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Now all arrays have the same lenth. I don't think taht iteration on arrays with different length is revealing. Tests with -= are added (why is it so in IE?).
var packed_array = [];
for (var i = 0; i < 11; i++) {
packed_array.push(i);
}
var holey_array1 = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
delete holey_array1[0];
var holey_array2 = [0, 1, 2, 3, 4, 5, 6, 7, 8];
holey_array2[10] = 0;
var holey_array3 = [0, 1, 2, 3, 4, 5, 6, 7, 8, /* hole */ , 10];
function packed_sum() {
var sum = 0;
for (var i = 0; i < packed_array.length; i++) {
sum += packed_array[i];
}
}
function holey_sum1() {
var sum = 0;
for (var i = 0; i < holey_array1.length; i++) {
sum += holey_array1[i];
}
}
function holey_sum2() {
var sum = 0;
for (var i = 0; i < holey_array2.length; i++) {
sum += holey_array2[i];
}
}
function holey_sum3() {
var sum = 0;
for (var i = 0; i < holey_array3.length; i++) {
sum += holey_array3[i];
}
}
function packed_neg_sum() {
var sum = 0;
for (var i = 0; i < packed_array.length; i++) {
sum -= packed_array[i];
}
}
function holey_neg_sum1() {
var sum = 0;
for (var i = 0; i < holey_array1.length; i++) {
sum -= holey_array1[i];
}
}
function holey_neg_sum2() {
var sum = 0;
for (var i = 0; i < holey_array2.length; i++) {
sum -= holey_array2[i];
}
}
function holey_neg_sum3() {
var sum = 0;
for (var i = 0; i < holey_array3.length; i++) {
sum -= holey_array3[i];
}
}
Ready to run.
Test | Ops/sec | |
---|---|---|
Packed array sum += |
| ready |
Holey array sum 1 += |
| ready |
Holey array sum 2 += |
| ready |
Holey array sum 3 += |
| ready |
Packed array sum -= |
| ready |
Holey array sum 1 -= |
| ready |
Holey array sum 2 -= |
| ready |
Holey array sum 3 -= |
| ready |
You can edit these tests or add more tests to this page by appending /edit to the URL.