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 Error Handling in Swift Error Handling Handling Errors

Make sure you're calling the parse method

am I calling Houston?

error.swift
enum ParserError: Error {
  case emptyDictionary
  case invalidKey
}

struct Parser {
  var data: [String : String?]?

  func parse() throws {

  guard let someData = data else { 
  throw ParserError.emptyDictionary 

  }
guard someData.keys.contains("someKey") else { 

throw ParserError.invalidKey 

}
  }
}

let data: [String : String?]? = ["someKey": nil]
let parser = Parser(data: data)

do {

let parse = try parse(from: data)

} catch {

print("not that one mate!")
}

1 Answer

thks mate