go-slice.md

go slice

slice copy

You can use the n := copy(dst, src) to copy slice. But you need to take care: only min(len(dst), len(src)) elements would be copied.

Attention: it's len(dst) not cap(dst). So for following example, it won't copy anything.

    src := []int{1,2,3}
    dst := make([]int, 0, 10)
    n := copy(dst, src)       // n = 0, nothing copied

If you want copy slice to a new one, you can also use append:

dst := append([]int(nil), src...)

references

official wiki: SliceTricks