Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

iOS Error Handling in Swift Error Handling Handling Errors

Alex Wride
Alex Wride
4,420 Points

Handling Errors Code Challenge

Hello community,

Stuck on this challenge. Point me in the right direction if possible. Otherwise, a solution to study works great too.

Thanks in advance :)

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

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

  func parse() throws {
     guard let value = data?["someValue"] else {
            throw ParserError.emptyDictionary
        }
        guard let key = data?["someKey"] else {
            throw ParserError.invalidKey
        }
  }
}

let data: [String : String?]? = ["someKey": nil]
let parser = Parser(data: data)
Michael Hulet
Michael Hulet
47,913 Points

Please note to any who answer: Answers that include working code with little to no explanation are against the community guidelines and will be redacted until the answer is edited to also include a solid explanation of why the code works