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iOS Swift Functions and Optionals Parameters and Tuples Tuples

Posted by ayman abdallah
ayman abdallah
787 Points

do not get parameters or tuples?

func greeting(#person: String) -> String { let language = "English" let greeting = "Hello (person)"

return greeting

}

please help because i do not under stand this

Justin VanHaven
Justin VanHaven
2,135 Points

Can you be more specific about what it is you don't understand?

Tuples are a 'newer' concept for a lot of iOS developers because they didn't really exist in Objective-C. I found this tutorial helpful for further clarifying some of the concepts introduced in this section:

http://www.raywenderlich.com/75289/swift-tutorial-part-3-tuples-protocols-delegates-table-views

Pierre Smith
Pierre Smith
11,842 Points

what you sent was just a function that takes a string and returns a string. The parameters is what's in between the brackets (#person: String), this is the same as (string person) in other languages. the # sign simply states that when the function is called "person" will have to be placed before the function input. like this:

let name = greetings(person: "Pierre") instead of let name = greetings("Pierre")

it's not needed, it's a feature made to help with legibility.

a tuple is pretty much a dictionary but more flexible.

I'm not gonna go through how this is true but if you like clarification visit http://koreyhinton.com/blog/ios/tuples-in-swift.html