How to check nil for Swift Optionals with out unwrap it?

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Raki iOS Dev

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Dec 11, 2015, 9:03:32 PM12/11/15
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I knew that safely unwrapping is as follows

    var firstName:String?

    if let firstName = firstName
    {
        dictionary.setObject(firstName, forKey: "firstName")
    }
    else 
    {
        dictionary.setObject("", forKey: "firstName")
    }

I want to add firstname to dictionary even it is nil also. I will have 10-15 var's in dictionary. I do not want to check for this condition 10-15 times for ear var. I am having more than 1000 optionals through out project.

So thought of writing writing a func will help me duplicate the code and reduce the number of lines. So implemented this func as below.

func checkNull(str:String) -> String
{
    return str.characters.count > 0 ? "\(str)" : ""
}

but while calling the func,

    let addressstr = self.checkNull(address?.firstName)

firstname is the var in address model here. The auto correction sugguests

    let addressstr = self.checkNull((address?.firstName)!)

The above line causes the crash.

Please let me know how can I fix this.


Regards,
Rakesh.Y,
iOSDeveloper,
Bangalore,India.
http://beginnersiosdev.blogspot.com/

Jesse Tayler

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Dec 12, 2015, 12:02:07 AM12/12/15
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causes what crash?

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Raki iOS Dev

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Dec 12, 2015, 1:43:37 AM12/12/15
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Fixed it by 

Nil Coalescing Operator

let str = address?.firstName ?? ""

Regards,
Rakesh.Y,
iOSDeveloper,
Bangalore,India.
http://beginnersiosdev.blogspot.com/

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