Introduction to functional programming with JavaScript

Dec 5, 2017Download as pptx, pdf

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Functional programming with JavaScript. As an object-oriented programmer, I found it difficult to understand functional programming or answering questions such as what is functional programming? Why functional programming? What are the advantages of functional programming? When do we use functional or object-oriented programming? In these slides, I will go over the terms like immutability, Pure functional, and Higher-order functions

Introduction to Functional
Programming with JavaScript

Introduction
Farzaneh Orak
Software Engineer
Hunter Industries
Mob programming

FP and OOP
Object-Oriented ProgrammingFunctional Programming

JavaScript language
• Multi-paradigm
• First class function

Which one is better?
• Depend on what are you trying to do
• Michael Fogus author of “Functional Javascript”
• Deal with data about people -> FP
• Simulate people -> Object-Oriented Programming

When we use functional
• People simulation
• Shared state
• Data about people
• Avoid shared state

What is Functional programming?
• Programming paradigm
• Style-organizing coding
• Way of thinking
• Express everything in term of functions
• Declarative

Why functional programming?
• Increase readability and maintainability
• Function reusability
• Easier testing and debug
• Needs low brain power to read the code

Why functional programming?
• Elegant code
• Predictability
• Less complex

Functional Programming principles
• Avoid sharing state
• Avoid side effect
• Avoid data mutation

Avoid side effect
• Console log
• Writing to a file

Avoid data mutation
• Once object created it can’t be changed

Functional Programming Techniques
• Pure function
• Higher order function

Functional Programming principles
• Pure functions
• Given the same input, It always returns the same output

Functional Programming Techniques
• Higher order function
• Function composition
• Functions re-usability
• Function currying

Functional Programming Techniques
• Higher order functions
• Pass functions as arguments or return functions

Higher order functions
• Map
• Filter
• Reduce

Reduce
• Higher order function
• Works on variety of datatype

Trie data structure
• Trie data structure
• Structural sharing

Libraries
• JFP
• Ramda
• Lodashfp
• Mori
• Immutable js

Recap
• Functional Programming Principles
• Avoid shared state
• Avoid side affect
• Avoid data mutation
• Functional Programming Techniques
• Pure function
• Higher order functions

Thank you!
Farzaneh Orak
linkedin.com/in/farzanehorak
@FarzanehOrak

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