Essential Books

Function types

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Every function has its own function type, made up of the parameter types and the return type of the function itself. For example the following function: 

func sum(x: Int, y: Int) -> (result: Int) { return x + y }

has a function type of: 

(Int, Int) -> (Int)

Function types can thus be used as parameters types or as return types for nesting functions.

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Functions:
* Functions
* Basic Use
* Methods
* Functions with Parameters
* Subscripts
* Operators are Functions
* Variadic Parameters
* Throwing Errors
* Inout Parameters
* Returning Values
* Functions With Closures
* Passing and returning functions
* Function types
* Trailing Closure Syntax
Table Of Contents