Go by Example: For

for is Go’s only looping construct. Here are three basic types of for loops.

 
package main

import "fmt"

func main() {

The most basic type, with a single condition.

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

A classic initial/condition/after for loop.

 
    for j := 7; j <= 9; j++ {
        fmt.Println(j)
    }

for without a condition will loop repeatedly until you break out of the loop or return from the enclosing function.

 
    for {
        fmt.Println("loop")
        break
    }
}

$ go run for.go
1
2
3
7
8
9
loop

We’ll see some other for forms later when we look at range statements, channels, and other data structures.

Next example: If/Else.

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