Swift Array contains function makes build times long

Question

I\'m not sure if this belongs in Stack Overflow, if it doesn\'t please let me know.

I have this piece of code that adds contacts to an array, if a contact with that phon

Answer 1

Chained + is the most common cause of slow build times in my experience. When people complain about build times, I always ask "you've got chained +, don't you." Have been right about 90%. For example:

let name: String = contact.givenName + " " + contact.middleName + " " + contact.familyName

and also

contacts.contains({($0.givenName + " " + $0.middleName + " " + $0.familyName) == name})

Use interpolation rather than chained +:

"\(contact.givenName) \(contact.middleName) \(contact.familyName)"

Or join an array:

[contact.givenName, contact.middleName, contact.familyName].joined(separator: " ")

In this particular case, I'd almost certainly make a helper though:

extension Contact {
    var fullName: String {
        return "\(contact.givenName) \(contact.middleName) \(contact.familyName)"
    }
}

Then much of the rest of your code would get simpler.

The problem with chained + is that it has many overloads, and so the compiler has to do a combinatorially explosive search of all the different versions of + it might use here.