Hello, I tried the print dictionary project in Xcode9. Like this:
var items = ["Bear":"0", "Glass":"1", "Car":"2"]
for (key, value) in items{
print("\(key): \(value)")
}
Output:
< p>
Glass: 1
Bear: 0
Car: 2
Why the output is not like this: bear: 0, glass: 1, car: 2
I don’t understand the reason for this output.
The dictionary stores the associations between the keys of the same type and the values of the same type in the collection, without a defined ordering.
Each value is associated with a unique key, which acts as a dictionary Identifier of the value. Unlike the items in the array, the items in the dictionary have no specified order.
Array – The array stores the same type of value in an ordered list.
Collection-A collection stores different values of the same type in a collection, in no defined order.
From the Apple documentation
See answer in English> From which direction swift starts to read dictionaries? 1
Hi I tried the print dictionary project in Xcode9. Like this:
var items = ["Bear":"0", "Glass":"1", "Car":"2"]
for (key, value) in items{
print("\(key): \(value)")
}
Output:
< p>
Glass: 1
Bear: 0
Car: 2
Why the output is not like this: bear: 0, glass: 1, car: 2
I don’t understand the reason for this output.
Dictionary:
The dictionary stores the same type of keys and collections Association between values of the same type without a defined ordering.
Each value is associated with a unique key, which serves as an identifier for that value in the dictionary. It is different from the items in the array. , The items in the dictionary have no specified order.
Array – arrays store the same type of values in an ordered list.
Collection – collections store different values of the same type in a collection , There is no defined order.
From the Apple documentation
