Hi all,

Just wonder:

1)When substracting array2 from array1 to get the difference elements
between two arrays(array1-array2), must array1.size >= array2?

2)Is there mentod in Array class that can  return the element only
unique to either of two arrays?

For example, array1=[1,2,3],array2=[1,4,7]
the return array is [2,3,4,7]

Thanks,

Li
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