Swift When we run above program using playground, we get following result true The initial array to be sorted for icecream is given as "Swift" and "great". Function to sort the array is declared as string datatype and its return type is mentioned as Boolean. Both the strings are compared and sorted in ascending order and stored in a new array. If the sorting is performed successful the function will return a true value else it will return false. Closure expression syntax uses 
constant parameters,
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variable parameters, and
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inout parameters.
Closure expression did not support default values. Variadic parameters and Tuples can also be used as parameter types and return types. let sum = {(no1: Int, no2: Int) -> Int in return no1 + no2 } let digits = sum(10, 20) println(digits) When we run the above program using playground, we get the following result: 30 The parameters and return type declarations mentioned in the function statement can also be represented by the inline closure expression function with 'in' keyword. Once declaring parameter and return types 'in' keyword is used to denote that the body of the closure.
Single Expression Implicit Returns Here, the function type of the sorted function's second argument makes it clear that a Bool value must be returned by the closure. Because the closure's body contains a single expression (s1 > s2) that returns a Bool value, there is no ambiguity, and the return keyword can be omitted. To return a Single expression statement in expression closures 'return' keyword is omitted in its declaration part. let count = [5, 10, -6, 75, 20] var descending = sorted(count, { n1, n2 in n1 > n2 }) var ascending = sorted(count, { n1, n2 in n1 < n2 })
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