Control Flow: if, switch, for Loops

Control Flow: if, switch, for Loops

Control flow lets your program make decisions and repeat actions. Go keeps these constructs readable and consistent.

if statement

Use if to run code conditionally.

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

switch

Use switch when you want to compare one value against several possibilities.

switch day {
case "Mon", "Tue", "Wed", "Thu", "Fri":
    fmt.Println("weekday")
case "Sat", "Sun":
    fmt.Println("weekend")
default:
    fmt.Println("unknown day")
}

switch does not fall through by default; this prevents bugs from missing break statements.

for loops

Go has one loop statement, for. It can act like a counter loop, a while loop, or an infinite loop.

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

j := 0
for j < 5 {
    fmt.Println(j)
    j++
}

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