Conditions and loops

if and else

if selects a block with a bool condition. Parentheses around the condition are optional.

func classify(score: int) {
    if score >= 10 {
        print("Gold")
    } else if score >= 5 {
        print("Silver")
    } else {
        print("Bronze")
    }
}

func main() {
    external score: int = 7
    classify(score)
}

Comparison operators include ==, !=, <, <=, >, and >=. Combine conditions with &&, ||, and !.

while and do while

while checks the condition before each iteration. do while executes the body once before checking the condition.

func main() {
    external count: int = 0
    while count < 3 {
        print(count)
        count += 1
    }

    do {
        count -= 1
    } while count > 0
}

Use break to end a loop. Use continue to start the next iteration. Update counters with += or -=.

Iterate over a list

func main() {
    var rewards: list<int> = [10, 20, 30]
    for (reward: rewards) {
        print(reward)
    }
}

The loop variable receives each element. See Lists for more operations.