go - Behavior of pointer in slice

Question

What's the behavior of creating slice from slice? When you have slice defined like this:

s := []int{2, 3, 5, 7, 11, 13}

And you want to modify your slice like this:

s = s[:3]
// s = [2 3 5]
s = s[:cap(s)]
// s = [2 3 5 7 11 13]

It actually works to "expand right" your slice. Which doesn't work is:

s = s[2:]
// s = [5 7 11 13]
s = [:cap(s)]
// s = [5 7 11 13]

So you can't "retain" the first two elements in this case, when you've created new slice. Even if the underlying array didn't change, you can't change your pointer to the beginning of that array, correct? Why is that?

Answer 1

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