JuniorTheoryCommon

What happens when this program is compiled and run?

SWIFT

actor Counter {
    var value = 0

    func increment() {
        value += 1
    }
}

let counter = Counter()
counter.increment()
print(await counter.value)

It does not compile

Expecting 1: calling an actor's method like a class method. From outside the actor every call needs await, so the compiler refuses counter.increment().
Expecting the call to run later and the program to print 0: Swift does not start a call to an actor without await; it refuses to compile it.

What does the program print once the call is written as await counter.increment()?
Why can increment change value without await inside the actor?

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JuniorTheoryCommon

What happens when this program is compiled and run?

SWIFT

actor Counter {
    var value = 0

    func increment() {
        value += 1
    }
}

let counter = Counter()
counter.increment()
print(await counter.value)

It does not compile

Expecting 1: calling an actor's method like a class method. From outside the actor every call needs await, so the compiler refuses counter.increment().
Expecting the call to run later and the program to print 0: Swift does not start a call to an actor without await; it refuses to compile it.

What does the program print once the call is written as await counter.increment()?
Why can increment change value without await inside the actor?

Back to questions Open topic in roadmap →Answer it yourself — Quiz