How to merge two slices in Go? Slice concatenation

Hello! I just started learning Go and ran into a problem. I need to merge two slices into one. In Python I would just write `list1 + list2`, but in Go, as I understand, there is no such operation. I have two slices of integers: ```go slice1 := []int{1, 2, 3} slice2 := []int{4, 5, 6} ``` I want to get the result: `[1 2 3 4 5 6]`. I tried using the `+` operator, but the compiler gives an error: `invalid operation: slice1 + slice2 (operator + not defined on slice)`. Then I came across the `append` function, but it adds elements one by one. Writing a loop for each element — isn't that inefficient? Maybe there is some built-in way or idiomatic solution in Go? Also, another question: if I use `append`, will it affect the original slices? Will the new slice be independent?