sparse vs dense array

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dense
var myArray = [];
for (var i = 0; i < 1000; i = i + 1) {
 myArray[i] = i;
}
ready
sparse
var myArray = [];
for (var i = 0; i < 2000; i = i + 2) {
 myArray[i] = i;
}
ready
dense object
var myArray = {};
for (var i = 0; i < 1000; i = i + 1) {
 myArray[i] = i;
}
ready
sparse object
var myArray = {};
for (var i = 0; i < 2000; i = i + 2) {
 myArray[i] = i;
}
ready

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