Swift dictionary allSatisfy method - check if all elements satisfy a given predicate

Swift dictionary allSatisfy method :

allSatisfy method is used to check if a predicate is satisfied by all elements in a swift dictionary. This method is defined as below :

func allSatisfy(((key: Key, value: Value)) -> Bool) -> Bool

This method takes one predicate and returns one boolean value based on each element satisfies that predicate or not.

Example of allSatisfy : Check if all values of a dictionary is even :

Let’s consider the below example program :

var number_dict = ["one": 1, "two": 2, "three": 3, "four": 4, "five": 5]

func isEvenValue(key: String, value: Int) -> Bool {
    return value%2 == 0 ;
}

print(number_dict.allSatisfy(isEvenValue))

This program checks if all values of dictionary numberdict_ is even or not. It will print false.

It will print true for the below program :

var number_dict = ["two": 2, "four": 4]

func isEvenValue(key: String, value: Int) -> Bool {
    return value%2 == 0 ;
}

print(number_dict.allSatisfy(isEvenValue))

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