How do I get a value from an associative array using Swift

Question

I am trying to get "readerSession" from an associative array and put it into a variable. This is what I've tried.

Code

println(thevalue)

Returned

{
    readerSession = 41;
    tax = 7;
    tax2 = 6;
    taxName = GST;
    taxName2 = PST;
}

So readerSession is equal to 41, now lets see if I can get ahold of it.

Code

println(thevalue["readerSession"])

Returned Optional(41)

Ok great, exactly what I want, now I'll try to put it into a variable.

Code

var readerSession = thevalue["readerSession"] as? String ?? "0"
println("READER SESSION \(readerSession) ")

Returned READER SESSION 0

Why is it "0"??? It should be "41"

Sergey Kalinichenko · Accepted Answer · 2014-12-07 00:45:50Z

1

The reason that you get "0" is because the value stored in the associative array is an Int, not a String. Therefore, when you try casting to String the cast returns null, so the right-hand side of the ?? kicks in, and you get a zero string.

You can fix it like this:

var readerSession : AnyObject = thevalue["readerSession"] ?? "0"

answered Dec 7, 2014 at 0:45

Sergey Kalinichenko

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2 Comments

newacct Over a year ago

but this way readerSession is sometimes an NSNumber and sometimes an NSString, which cannot be a good design

Sergey Kalinichenko Over a year ago

@newacct I agree - this is only a workaround for the given design.

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