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For swift arrays, we can simply use the count property to find out how many elements are in the collection. However, we can't do the same for dictionary keys. Is the only way to do this to use a for loop and counter?
var myDict: [String: AnyObject] = // ... intialize dictionary with keys and values myDict.keys.count // doesn't work 
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Swift Dictionary contains() The contains() method checks whether the specified key or value is present in the dictionary or not.
The Key type of the dictionary is Int , and the Value type of the dictionary is String . To create a dictionary with no key-value pairs, use an empty dictionary literal ( [:] ). var emptyDict: [String: String] = [:]
There is no order. Dictionaries in Swift are an unordered collection type. The order in which the values will be returned cannot be determined. If you need an ordered collection of values, I recommend using an array.
Swift dictionary is an unordered collection of items. It stores elements in key/value pairs. Here, keys are unique identifiers that are associated with each value.
There is a count property on dictionary, so myDict.count will work.
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Why not simply use the count property on myDict?
myDict.count 
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