Append one slice to another with ...:
a := []int{1, 2, 3}
b := []int{4, 5, 6}
c := append(a, b...)
The ... expands b into individual elements. Without it, you'd be appending a slice as a single element, which doesn't work for []int.
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$ curl repovive.com/roadmaps/go/slices/appending-slices
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