range

Go has a helpful range keyword that works similar to enumerate in python. Ranging over a slice produces indexes and elements and ranging over a map produces key value pairs.

Range over slice/map

slice := []string{"hello", "world", "!"}
 
for i, element := range slice {
    fmt.Println(i, element, ":")
 
    for _, ch := range element {
        fmt.Printf("    %q\n", ch) 
        // %q prints out a rune an not an unsinged int
    }
}

Range over int

Go also lets you shortcut the full for loop syntax by ranging over an integer.

for i := range 10 {
	// i will go from 0 to 9 and then the loop will exit
}