Array.push vs Array index vs Object index

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Testing in
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Array.push
for(var t = [], i = 0; i < 10000; i++)
  t.push(i)
ready
Array index
for(var t = [], i = 0; i < 10000; i++)
  t[i] = i
ready
Object index
for(var t = {length:0}, i = 0; i < 10000; i++) {
  t[i] = i
  t.length++
}
ready

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