In this post we create a simple program to reverse a list, not a specific type of list but a generic list.
Photo by Thomas Bormans on Unsplash
The Reverse Function
func reverse[T any](list []T) []T {
for i, j := 0, len(list)-1; i < j; {
list[i], list[j] = list[j], list[i]
i++
j--
}
return list
}
This is a generic function called reverse that takes a slice of any type T as input and returns a reversed slice of the same type T.
func reverse[T any](list []T) : []T defines the reverse function. The [T any] syntax indicates that the function is generic and can work with slices of any type.
Inside the function, a loop is used to reverse the elements of the list. The loop iterates from the beginning (i) and end (j) of the slice toward the middle, swapping elements at positions i and j until they meet.
list[i], list[j] = list[j], list[i] swaps the elements at positions i and j. Pretty neat way to swap elements !!
i++ increments i, and j-- decrements j to move towards the center of the slice.
Once the loop completes, the function returns the reversed list.
The Main Function
package main
import "fmt"
func main() {
l := []int{1, 2, 3, 4}
l = reverse[int](l)
fmt.Println(l)
}
In the main function, a slice of integers l is initialized with values {1, 2, 3, 4}.
The reverse function is called with the slice l, and the returned result is assigned back to l.
Finally, fmt.Println(l) prints the reversed slice.
Video Format
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Conclusion
This code demonstrates how to use a generic function to reverse the elements of a slice in Go.
It’s worth noting that the usage of generics in Go is a feature introduced in Go 1.18 and won’t work with versions before that.
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