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iOS Swift Functions and Optionals Optionals What is an Optional?

am lost

where am i goin wrong

search.swift
func search(name: String) -> String? {
    let names = ["Doc","Grumpy","Happy","Sleepy","Bashful","Sneezy","Dopey"]
    for n in names {
        if n == name {
            return n
        }
    }
    return nil
}

2 Answers

Jacob Knowles
Jacob Knowles
3,203 Points

Hi Macdonald! Don't be discouraged, challenges and errors are here to make us better developers. Here's what I did as my solution.

func search(#name: String) -> String? {
    let names = ["Doc","Grumpy","Happy","Sleepy","Bashful","Sneezy","Dopey"]
    for n in names {
        if n == name {
            return n
        }
    }
    return nil
}

if let result = search(name:"Doc") {
  println("Found")
}

I have a function called search, with the parameter being that I pass it a string. This function returns an optional, and I know this because there's a question mark after the String. If the string passed ends up being a name, this function will return it. If the string passed is not in the array of names, we return a nil. Finally down below I declared a constant named result, using an if let statement. I call my search function and pass the name "Doc". Since Doc is in my array, the console will print "Found".

Don't get discouraged friend, it's all a learning process. See you around the forums!

thanx bru