how to use range in for loop - golang

Introduction

Here we are going to explain, usage of range on slices in for loop

usage of range on []int slice for loop

    // declare and init values in slice
    nums := []int{2, 3, 4}

    //iterate nums slice with range
    //i will have index and num will have value in index 
    for i, num := range nums {
        fmt.Printf("i=%d num=%d\n", i, num)
    }

output:

i=0 num=2
i=1 num=3
i=2 num=4

usage of range on map[string]string slice for loop

    //define map with data with key/value pairs
    map1 := map[string]string{"A": "Apple", "B": "Banana"}

    //iterates over key/value pairs
    for k, v := range map1 {
        fmt.Printf("%s -> %s\n", k, v)
    }

    //just on key
    for k := range map1 {
        fmt.Printf("key: %s value: %s\n", k, map1[k])
    }

output:

A -> Apple
B -> Banana
key: A value: Apple
key: B value: Banana