Loops

• The for keyword is used for all loops in Go.
• The most basic type of for loop looks similar to what you see in other C-like languages:
  • init statement
  • condition
  • post statement
  • Followed by block
    • Block code executed on each pass through loop

package main

import "fmt"

func main() {
    for i := 1; i <= 3; i++ {
        fmt.Println(i)
    }
}

• Post statement can be whatever you want
  • i++, i-- (change init/condition accordingly)
  • i += 1, i += 2
  • But don't fail to increment it! If we used i += 0, for example, we'd have an infinite loop and would have to press Ctrl-C to interrupt the program.

Block scope rules apply to for loops:

package main

import "fmt"

func main() {
    beforeLoop := 888
    for i := 1; i <= 5; i++ {
        inLoop := 999
        fmt.Println(i)
    }
    fmt.Println(beforeLoop) // OK
    fmt.Println(i)          // Error!
    fmt.Println(inLoop)     // Error!
}