Get reason why my guard handled an error in Swift

Question

I don't know if this question has already been asked partly because I don't know how to formulate it... That's why I create this question with a concrete example to make it clear.

I have a guard statement like this:

guard let id = place["place_id"].string,
      let name = place["name"].string,
      let lat = place["geometry"]["location"]["lat"].double,
      let long = place["geometry"]["location"]["lng"].double

}

This statement allows me to handle missing datas in a JSON. However, I have much more data to check compared to this example. Therefore, is there a way to find out which one of these data is missing? I mean, can I use the guard statement to output the missing data in my console ?

Hope it's clear. Thanks in advance for your help.

Decode the JSON with `Decodable` in Swift 4. The decoder tells you exactly what's wrong and where. — vadian, Apr 28 '18 at 16:46

score 0 · Answer 1 · answered Apr 28 '18 at 16:47

0

You could do it like so:

guard let id = place["place_id"].string else { 
    print("place_id is nil")
 }
guard let name = place["name"].string else {
    print("name is nil")
}
...

answered Apr 28 '18 at 16:47

Martin Muldoon

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That is what I did, but not so clean.... – Paul Bénéteau Apr 28 '18 at 17:03
As Vadian indicated using Decodable is clean, but you have to learn it. At least with this, you understand the syntax of the Guard statement. – Martin Muldoon Apr 28 '18 at 17:08
well, you end the function or the code after the guard. Depends and what your doing. So you need to set return or continue for loops. Best is codable – Björn Ro Apr 28 '18 at 17:12

Get reason why my guard handled an error in Swift

1 Answers1