Conditionals

If Go Specification

Golang has control structures as you may have seen them in other programming languages

You just won't see parenthesis () around them

value2 := 7
if value2 > 10 {
    value2++
}

There exists if, else if, else, switch but there is not a ternary operator ?:

const movie = "Rocky"
var score int
if movie == "Rambo" {
    score = 9
} else if movie == "Rocky" {
    score = 10
} else {
    score = 6
}

Traditionally with a ternary operator you could do the following in one line

num := 3
isFlag := num == 3 ? "I am 3" : "Nope"

You can do the above statement as follows

var str string
if num == 3 {
    str = "I am 3"
} else {
    str = "Nope"
}

There are some nice features to the if statement

if ok := strings.Contains(val, "foo"); ok {
    return true
}
return false

Notice here we assign a variable named ok and then if ok is true it will enter the if block

Switch statement

Golang also has a switch statement which can be used like this

Switch Go Specification

var food string = "lemons"

switch food {
case "apples"
    fmt.Println("yay apples")
case "lemons"
    fmt.Println("Why lemons?")
default:
    fmt.Println("Hmm")
}

Notice that the switch statement doesn't have any break statements

• A case body breaks automatically, unless it ends with a fallthrough statement.
• Switch cases evaluate cases from top to bottom, stopping when a case succeeds.
• Switch without a condition is the same as switch true.
• This construct can be a clean way to write long if-then-else chains.

Conditionals Playground