In Swift, when the function returns some value you can assign it to a variable or ignore it.
Let’s say you have your own function called makeSynchronization, it returns the Bool value-based if the synchronization was successful or not.
func makeSynchronization() -> Bool {
return Bool.random()
}
The most popular way to ignore function results is to use “_” instead of using an unwanted variable.
Like this:
_ = makeSynchronization()
However, you can mark your function so that it’s not required to assign a result to something.
To it, you can use @discardableResult above function declaration.
@discardableResult
func makeSynchronization() -> Bool {
return Bool.random()
}
Now you can execute that function and you can remove “_ = ” and the compiler won’t show any error.
makeSynchronization()
Notice that “_ = “ works as well.
