Kristopher Valas
1,895 PointsI'm not sure what I'm doing wrong in regards to this exercise.
I'm hoping someone could help me out with this exercise. I'm not entirely sure why this is failing.
enum ParserError: Error {
case emptyDictionary
case invalidKey
}
struct Parser {
var data: [String : String?]?
func parse() throws {
guard let newdata = data else {
throw ParserError.emptyDictionary
}
let keys = newdata.keys
for x in keys {
if keys.contains(x) {
if let data = newdata[x] {
//do something with data
}
}else {
throw ParserError.invalidKey
}
}
}
}
let data: [String : String?]? = ["someKey": nil]
let parser = Parser(data: data)
1 Answer
Jhoan Arango
Treehouse Moderator 12,548 PointsHello,
Here is an answer that may help you solve your problem !
enum ParserError: Error {
case emptyDictionary
case invalidKey
}
struct Parser {
var data: [String : String?]?
func parse() throws {
// Here we check for a condition
guard data?.isEmpty == false else {
throw ParserError.emptyDictionary
}
// Here we unwrap the keys, and then check for a condition,
guard let keys = data?.keys, keys.contains("someKey") else {
throw ParserError.invalidKey
}
}
}
let data: [String : String?]? = ["someKey": nil]
let parser = Parser(data: data)
When unwrapping an optional value, remember to create a temporary store property.
// example
guard let someProperty = someOptional else { return }
Hope this helps
Good luck
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