How to extract the first n elements from an array?

In Go, to extract the first n elements from a slice, you can use slicing operation:

arr := []int{1, 2, 3, 4, 5}
n := 3

// Check that n does not exceed the length of the slice
if n > len(arr) {
    n = len(arr)
}

firstN := arr[:n]
fmt.Println(firstN) // Output: [1 2 3]

It is important to check that n does not exceed the length of the slice to avoid runtime panic.