Generics, also known as parametric polymorphism, enable you to write code that operates on multiple types without explicitly specifying the types upfront. This leads to more concise, reusable, and type-safe code.

generic.go

// In the PrintSlice function, T is a type parameter, and any is a type constraint.
// The any constraint is built into the language and allows any type to be used.
// The function can be called with any slice type, such as []int or []string.

package main

import "fmt"

// PrintSlice prints each element of a slice of any type.
func PrintSlice[T any](s []T) {
    for _, v := range s {
        fmt.Println(v)
    }
}

func main() {
    // Example usage with an int slice.
    intSlice := []int{1, 2, 3}
    PrintSlice[int](intSlice)

    // Example usage with a string slice.
    stringSlice := []string{"hello", "world"}
    PrintSlice[string](stringSlice)
}