Scala Functions Short link to this slides

http://bit.ly/s-scala-functions

Things we will cover:1. Functions as methods on objects2. Local or nested functions vs private methods3. Function literals and function values4. Placeholder syntax5. Partial functions, partially applied functions & currying6. Tail recursive functions7. Function parameters types - repeated, named & default8. Function closure9. Functions vs methods - signature, type params & in-

depth.

Functions as methods on objects

Local or nested functions

Function literals and function values

Placeholder syntax for function parameters

Partial function

Partially applied functions

Currying

Tail recursive functions

Tail Recursion

Recursion

Tail recursive functions are functions that call themselves as their last action. Scala compiler will do tail call optimizations by not allocating a stack frame per function invocation and it would replace it with the function call to jump back to the beginning of the function after updating the function parameters with new values.

Function parameter types

Function closureThe name “closure” arises from the act of “closing” the function literal by “capturing” the bindings of its free variables.

A free variable is variable which the function literal does not define or is not passed into a function.

Take a look at e.g. on the side, abc is a free variable which is closed into incAbc function definition.

Closure sees the change to the variable every time a function invocation is done.

Function vs methods - signature

Function vs methods - type params

Function vs methods - in depthA function is simply an object that wraps a method, viz. apply, and Scala provides convenience syntax for invoking the apply method of a function without having to actually name it.

scalac test.scala

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Slides - http://bit.ly/s-scala-functions

Thank you.