Learning Swift™ Programming

Iterating Over Dictionaries

You can iterate over a dictionary much the same way that you iterate over an array—by using a for-in loop. The only difference between an array for-in loop and a dictionary for-in loop is that with the dictionary loop, you are able to get both keys and values while looping, like this:

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for (ssn,name) in people {    println("SSN: \(ssn) Name: \(name)")}// SSN: 198364775 Name: Francis Green// SSN: 176354888 Name: Trevor Kalan// SSN: 186574663 Name: John Smith

You can also loop through just the keys of a dictionary, with .keys. In addition, you can loop though just the values with .values:

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for ssn in people.keys {    println("SSN: \(ssn)")}for name in people.values ...