For Loops

In Go, there is only one looping construct, the for loop. The basic for loop has three components separated by semicolons:

• the init statement: executed before the first iteration
• the condition expression: evaluated before every iteration
• the post statement: executed at the end of every iteration

// [...]

func main() {
    sum := 0
    for i := 0; i < 10; i++ {
        sum += i
        fmt.Println(sum)
    }
}

For continued

The init and post statements are optional.

// [...]

func main() {
    sum := 1
    for ; sum < 1000; {
        sum += sum
    }
    fmt.Println(sum)
}

While replacement

At that point you can drop the semicolons: C's while is spelled for in Go.

// [...]

func main() {
    sum := 1
    for sum < 1000 {
        sum += sum
    }
    fmt.Println(sum)
}

Infinite loop

If you omit the loop condition it loops forever, so an infinite loop is compactly expressed.

// [...]

func main() {
    for {
        // do something infinitely many times
    }
}

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