Learn X By Example
Learn X By Example

    Go by Example: For

    Go by Example : For

    for is Go’s only looping construct. Here are some 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 := 0; j < 3; j++ {
        fmt.Println(j)
    }

    Another way of accomplishing the basic “do this N times” iteration is range over an integer.

        for i := range 3 {
        fmt.Println("range", i)
    }

    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
    }

    You can also continue to the next iteration of the loop.

        for n := range 6 {
        if n%2 == 0 {
            continue
        }
        fmt.Println(n)
    }
}
    $ go run for.go
1
2
3
0
1
2
range 0
range 1
range 2
loop
1
3
5

    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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