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HigherOrder Functions Introduction Sort Map Reduce Filter Introduction: What is Function? Functions  are self-contained chunks of code that perform a specific task.  Function  name should give clarity that what it does, and that name is used to “call” the function to perform its task when needed. Every function in Swift has a type, consisting of the function’s parameter types and return type. You can use this type like any other type in Swift, which makes it easy to pass functions as parameters to other functions, and to return functions from functions.  Functions can also be written within other functions to encapsulate useful functionality within a nested function scope. If the entire body of the function is a single expression, the function implicitly returns that expression. What is HigherOrder Function? A higher order function is a function that accepts one or more functions as an input (or) returns a value of function type as output (or) doing both Passing Func...