I don't understand something when I want to pop out first element of a
slice and use it.
Here is my version:
s := []int{1,2,3}
first := s[0]
s = s[1:]
Here is a version that I saw in the standard library:
https://golang.org/src/database/sql/sql.go#L791
first := s[0]
copy(s, s[1:])
s = s[:len(s) - 1]
I wonder, why do we need to translate the other elements to the left with a
copy ?
In the first case, I guess the first element will still be found in the
underlying array, and in the second case the last element.
It's not like for avoiding a memory leak, because neither version allocates
a new underlying array.
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