[Omitting Arguments] How does this work?

Using Swift
1 
func greet(_ person : String, abc day: String) -> String {
    return "Hello \(person), today is \(day)."
}
print (greet("John", abc: "Wednesday")) // Prints Hello John, today is Wednesday.

func greet(_ person : String, day: String) -> String {
    return "Hello \(person), today is \(day)."
}
print (greet("John", day: "Wednesday")) // Prints Hello John, today is Wednesday.

Both of these have the same output. How does the first one work ?
Any link I can refer to understand this would be very helpful.
Thank You.

2

Hello Kushal. You may enjoy reading the Function Argument Labels and Parameter Names chapter of Swift documentation. You'll learn how _, person, abc and day interact together.

2 Likes
3

Clarified. Thank You.

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