arrays-and-slices.go

package main

import "fmt"

// printArray prints type, elements' values, capacity and length of an array
func printArray(a [3]int) {
    fmt.Printf("%T\t", a)
    for _, v := range a {
        fmt.Printf("%d ", v)
    }
    fmt.Printf("\tCapacity: %d, Length: %d\n", cap(a), len(a))
}

// printSlice prints type, elements' values, capacity and length of a slice
func printSlice(s []int) {
    fmt.Printf("%T\t", s)
    for _, v := range s {
        fmt.Printf("%d ", v)
    }
    fmt.Printf("\tCapacity: %d, Length: %d\n", cap(s), len(s))
}

func main() {
    a := [...]int{1,2,3}    // array
    s := []int{1,2,3}       // slice

    // I created different functions for printing info on arrays and slices
    // since they are different types ...
    printArray(a)
    printSlice(s)

    // You can't do this with arrays since they're not dynamic ...
    s = append(s, -100)
    printSlice(s)
    s = append(s, 42, 43)
    printSlice(s)
    s = append(s, 44)
    printSlice(s)
}