For Loop

Let's learn about Go's Loop

For

• Go's looping is only possible with for loop

Range

• Allows you to apply loops to slice or map

  • range gives you the index and value of the loop!

  • However, it can only be used inside for

  • ex)

    package main
    
    import "fmt"
    
    func addAll(numbers ...int) int {
     total := 0
     // for loop w/ range
     for _, number := range numbers {
      total += number
     }
     return total
    }
    
    func main() {
     total := addAll(1, 2, 3, 4, 5, 6, 7, 8, 9)
     fmt.Println(total)
    }
    

• When traversing a loop using range, it returns two values as follows:

  1. index

  2. copy of the element at that index

• If you don't need the index and only need the value, you can use the ignored value underscore (_) as in the example above

+

for loop using range is similar to python's enumerate!

For without Range

• You can create for loops without range

  • ex)

    func add(numbers ...int) {
     for i := 0; i < len(numbers); i++ {
      fmt.Println(i)
     }
    }

• but, since the code gets longer and inefficient, I don't think I'll use it!