1. Functional Programming - Introducing F# 06/15/2012

2. Example Give me a list of numbers from 1 to 100. Tell me how ? Tell me what ?

3. What?Functional programming is a programming paradigmthat treats computation as the evaluation ofmathematical functions and avoids state and mutabledata. y = f (x)A function is a transformation. It transforms one or more inputs into exactlyone output.

4. Why? Succinct & simpler programs Small code base, low dev/maintenance cost. A number of powerful new ways to structure and reason about programs. Immutability High order function Pattern Matching

5. How? Immutability Type Inference Recursion High Order Functions Partial Application Pattern Matching Unit of Measure

6. ImmutabilityBy default, values are immutable. Use keywordmutable to mark it as mutable.

7. Type Inference F# can deduce data types automatically. Type annotation is necessary in certain case.

8. Recursion Functional programming prefers recursion to imperative for-each loops. Prefer tail recursion to avoid stack overflow

9. High order Function Functions in F#

10. High order Function Functions as First Class Member Functions that accept a function as a parameter or returns a function

11. High Order Function Map Fold Zip Filter Pipeline Function Composition Partial Application

12. Pattern Match Compare data with a logical structure Decompose data into its constituent parts Extract information from constructs in various ways

13. Unit of Measure Floating point and signed integer values in F# can have associated units of measure. Compile time checking.

14. Functional Programming in Real World Erlang developed in Ericsson widely used in T- Mobile, Facebook.... Industry Communication Finance industry Scientific computation AI Languages support FP Haskell Scala Python Clojure

15. Resources The F# Survival Guide Functional Programming for the Real World