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The value of index is -1, which indicates that the element was not found in list1. You need to check the values of all the variables to see why.

[edit]
In the last case x contains "higoodbye" and y contains "hi". The search succeeds and the contents of the element in list1 is modified. On the next iteration of list2, y contains "goodbye" so it matches x, but the element in list1 has been modified so the indexOf method returns -1.
[/edit]

modified 1-May-17 3:31am.

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