CODEWITHSUNDEEP
swift
ray ray
ray ray

Reputation: 115

Set up function with optional input parameter (swift)

Can i set up function with optional input parameter? that means when i call that function, i can either pass the parameter or not to pass the parameter.

Upvotes: 1

Views: 3261

Answers (1)

Thilo
Thilo

Reputation: 262504

Yes, you can supply a default parameter value, in which case you can leave the parameter off at the call site:

func someFunction(someParam: Int = 12) {
    print(someParam)
}

someFunction(10)

someFunction()

You can combine this with Optional to default to nil:

func someFunction(someParam: Int? = nil) {
    if let x = someParam {
        print(x)
    }
    else {
        print("no param given")
    }
}

Parameters with default values should be placed at the end of the parameter list.

Upvotes: 8

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