CODEWITHSUNDEEP
swift
Umang Kothari
Umang Kothari

Reputation: 3694

Swift: to call function seems confusing

I have copied following code snippets from developer site of apple.

  1. Following code works as expectation:

    func greet(day: String) -> String {
    return "Hello Umang, today is \(day)."
}
print(greet("Sunday"))

  2. While running following code showing error,

    func greet(day: String) -> String {
     return "Hello Umang, today is \(day)."
}
print(greet(day : "Sunday"))

    Error:

    <stdin>:7:12: error: extraneous argument label 'day:' in call
print(greet(day : "Sunday"))
^~~~~~~

I am novice in Swift programming, I have background in Java. So I am facing problem in understanding.

Please guide me if anything I have misunderstood.

Upvotes: 0

Views: 75

Answers (1)

Sandeep
Sandeep

Reputation: 21134

It is because first argument in a method is treated as unnamed parameter. So, you can only use greet("Sunday") but if you want your first argument to be a named parameter, you can use the following syntax.

func greet(day day: String) -> String {
     return "Hello Umang, today is \(day)."
}

Notice, the day is name for the parameter day.

Now, you can use it as,

print(greet(day : "Sunday"))

Upvotes: 4

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