If I have
var arr = new Array(50); // Should be dense, I guess?
arr[20] = 0;
arr[40] = 1;
arr[20] = undefined;
var keys = Object.keys(arr);
Will this access pattern make v8 think arr is a sparse array and change to
using a hash table?
Also, is copying from old back store to new back store unavoidable when I
grow the array by doing
for (var i = 50; i < 100; i++) {
arr[i] = 0;
}
? Thanks.
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