Go by Example: If/Else

Branching with if and else in Go is straight-forward.

 
package main

import "fmt"

func main() {

Here’s a basic example.

 
    if 7%2 == 0 {
        fmt.Println("7 is even")
    } else {
        fmt.Println("7 is odd")
    }

You can have an if statement without an else.

 
    if 8%4 == 0 {
        fmt.Println("8 is divisible by 4")
    }

A statement can proceed conditionals; any variables declared in this statement are available in all branches.

 
    if num := 9; num < 0 {
        fmt.Println(num, "is negative")
    } else if num < 10 {
        fmt.Println(num, "has 1 digit")
    } else {
        fmt.Println(num, "has multiple digits")
    }
}

Note that you don’t need parentheses around conditions in Go, but that the brackets are required.

 
$ go run if-else.go 
7 is odd
8 is divisible by 4
9 has 1 digit

There is no ternary if in Go, so you’ll need to use a full if statement even for basic conditions.

Next example: Switch.

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