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Map, filter, reduce, Flatmap and  CompactMap drop in Swift. Simple Higher Order Function Higher order functions are simply functions that operate on other functions by either taking a function or closures as an argument, or returning a function. That can be used on collection types such as Array or Dictionary Map : - " Use map to loop over a collection and apply the same operation to each element in the collection. The map function returns an array containing the results of applying a mapping or transform function to each item:" That used for-loop-  let arrays = [2.0,4.0,5.0,7.0] var arraySquar: [Double] = [] for value in arrays {   arraySquar.append(value*value) } // [4.0, 16.0, 25.0, 49.0] Now With map let arrays = [2.0,4.0,5.0,7.0] let arraySquar= arrays .map {$0 * $0} // [4.0, 16.0, 25.0, 49.0] let scores = [0,28,124] let words = scores.map { NumberFormatter.localizedString(from: $0 as NSNumber, number: .spellOut) } print(wo...