Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

iOS Functions in Swift Functions in Swift Recap: Functions

Monika Kesarwani
Monika Kesarwani
5,851 Points

Function

Why will this code not compile?

func someFunction(a: Int) -> Bool { return a }

By my knowledge there is literal type (instead of Bool it should be Int) mentioned mistake . Can anybody explain me better what is mistake here.

1 Answer

Brendan Whiting
seal-mask
.a{fill-rule:evenodd;}techdegree seal-36
Brendan Whiting
Front End Web Development Techdegree Graduate 84,704 Points
func someFunction(a: Int) -> Bool { 
  return a 
}
  • we're saying this function takes a parameter a of type Int
  • we're saying this function returns a Bool with -> Bool
  • we return a, which is of type Int. So we're breaking the contract we set up where we said we were going to return a Bool
Monika Kesarwani
Monika Kesarwani
5,851 Points

thank you so much for your help. now I understand. but how i will write in code. I mean what is write code.