array length: 5
exists([0]) is 1
exists([1]) is 1
exists([2]) is 1
exists([3]) is 1
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defined([1]) is 1
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defined([3]) is 1
defined([4]) is 1
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true([2]) is 1
true([3]) is 1
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([0]) is 1
([1]) is 2
([2]) is 3
([3]) is 4
([4]) is 5

array length: 5
exists([0]) is 1
exists([1]) is 1
exists([2]) is 
exists([3]) is 
exists([4]) is 1
defined([0]) is 1
defined([1]) is 1
defined([2]) is 
defined([3]) is 
defined([4]) is 1
true([0]) is 1
true([1]) is 1
true([2]) is 
true([3]) is 
true([4]) is 1
([0]) is 1
([1]) is 2
([2]) is 
([3]) is 
([4]) is 5

array length: 5
exists([0]) is 1
exists([1]) is 1
exists([2]) is 1
exists([3]) is 1
exists([4]) is 1
defined([0]) is 
defined([1]) is 1
defined([2]) is 
defined([3]) is 
defined([4]) is 1
true([0]) is 
true([1]) is 1
true([2]) is 
true([3]) is 
true([4]) is 1
([0]) is 
([1]) is 2
([2]) is 
([3]) is 
([4]) is 5

array length: 4
exists([0]) is 1
exists([1]) is 1
exists([2]) is 1
exists([3]) is 1
defined([0]) is 
defined([1]) is 1
defined([2]) is 
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true([0]) is 
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([0]) is 
([1]) is 2
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([3]) is 

array length: 0

array length: 3
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exists([1]) is 1
exists([2]) is 1
defined([0]) is 1
defined([1]) is 1
defined([2]) is 1
true([0]) is 1
true([1]) is 1
true([2]) is 1
([0]) is 1
([1]) is 2
([2]) is 3