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iOS Swift 2.0 Functions Functions in Swift 2.0 Recap: Functions

Posted by str
str
3,149 Points

Stuck on Functions Code Challenge.

The code challenge keep asking me to "Make sure you're specifying the correct return type for the function and returning the correct value!" I'm a slightly confused as to what it means "correct return type" If someone could explain what I've missed I'd really appreciate it. Thank you for your time.

functions.swift 
// Enter your code below
func temperatureInFahrenheit (temperature: Double) -> Int {
  let temperature = 78
  return temperature
}
Greg Kaleka
Greg Kaleka
39,021 Points
Greg Kaleka
Greg Kaleka
39,021 Points

Hey Sean,

Jason's answer is correct. One other key point, though: since this is in a function definition, this means later in your code you (or someone else) will be passing a number into the function. By explicitly creating a constant named temperature inside the function, you're effectively ignoring future you's input. Here's what would happen:

dontDoThis.swift 
func temperatureInFahrenheit (temperature: Double) -> Int {
  let temperature = 78
  return temperature
}

let fTemp = temperatureInFahrenheit(10.0)

print(fTemp) // 78!

Hope this makes sense!

1 Answer

Jason Anders
MOD
Jason Anders
Treehouse Moderator 145,858 Points
Jason Anders
Jason Anders
Treehouse Moderator 145,858 Points

Hey Sean,

You've almost got it, there is just a couple of things.

First, you are getting that error, because the challenge wants the return type to be Double and you have coded a return type of Int (the declaration after the -> is the return type.

Second, the challenge didn't ask for you to declare a value for the variable temperature (and challenges are very picky). It just wants you to return it.

func temperatureInFahrenheit (temperature: Double) -> Double {
  return temperature
}

Hope that helps. :) :dizzy: