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Start your free trialMohamed Almulla
2,506 PointsHow do I check if they key exist or is not nil?
I need help writing the guard statement for the key and I don't really understand the hint that we were given that much either. Would be great if someone can tell me what I'm missing. Thank you very much.
enum ParserError: Error {
case emptyDictionary
case invalidKey
}
struct Parser {
var data: [String : String?]?
func parse(from dict: [String: String]) throws -> Parser {
guard let parse = dict["someKey"] else{
throw ParserError.emptyDictionary
}
guard let val = dict[keys] else {
throw ParserError.invalidKey
}
}
}
let data: [String : String?]? = ["someKey": nil]
let parser = Parser(data: data)
1 Answer
Brandon Mahoney
iOS Development with Swift Techdegree Graduate 30,149 PointsYou do not need to create a new constant for this instead you can just check the values.
func parse() throws {
guard data?.isEmpty == false else {
throw ParserError.emptyDictionary
}
guard (data?["someKey"]) != nil else {
throw ParserError.invalidKey
}
}
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