swift - How can I catch error of Dictionary at initializing time?

Question

with this down code I would get error, because I am using same key twice, I want to know if my app or code end up to this kind of error, how can I catch the error? and stop crashing app.

    let randomDic = [
    "a": 1,
    "b": 2,
    "c": 3,
    "c": 3
]

question from:https://stackoverflow.com/questions/65545522/how-can-i-catch-error-of-dictionary-at-initializing-time

Answer 1

You'd have to add the items iteratively and test for it manually. At a simple level something like this:

if string[newKey] == nil {
  string[newKey] = newValue 
} else {
  //handle error
}

In reality it'd probably be more complex than that depending on the app logic behind it, but a better approach would be to design the app so that the situation can't occur in the first place.

I'd also suggest not using string as a variable name, especially for something that is a Dictionary not a String!