Everyday Functional Programming in JavaScript

Aug 2, 20170 likes70 views

The document is a presentation about everyday functional programming in JavaScript. It discusses how functional programming uses functions as atomic units with known input/output behavior rather than objects. Immutable data is preferred to simplify parallel processing and declarative code is easier to read. The presenter will do a live coding demo covering concepts like unit testing, refactoring, function composition, currying, data immutability, and using high order functions instead of loops.

Everyday Functional
Programming in
JavaScript
Leo Hernandez
@leojh

About Me
● From South Florida
● Been developing since 2004
● Started out in .Net but now mostly JavaScript
● Really excited about JavaScript world and
newer ways of doing the same thing
@leojh

In Functional Programming
code is built by using
Functions as atomic units
@leojh

Functions are good atomic
units because they have a
known input -> output lifecycle
@leojh

Unlike Objects, they tend to be
simple and have no side
effects
@leojh

In Functional Programming,
data is supposed to be
immutable
@leojh

Data Immutability helps with
keeping things simple and with
parallel processing
@leojh

Part of the goal is to make the
code declarative so it’s easier
to read since it conveys
intention
@leojh

const myBestCustomers = customers =>
customersWhoBuyATonFromMe(customers)
.and
.giveMeGoodReviewsOnYelp(customers)
@leojh

You’re probably already
working in FP and may not
realize it
@leojh

If you’re using React, you’re
basically using a plain JS
Function to render things on a
screen
@leojh

const ArticleTitle = title =>
<h3>{title}</h3>
@leojh

Concepts During Live Coding
● Unit Testing
● Refactoring
● Function Composition
● Curry
● Data Immutability and transformation /
projections
● ES6+
@leojh

Before you write any
traditional loop, ask yourself
why?
You should probably use a
High Order Function instead
@leojh

This document summarizes a presentation on everyday functional programming in JavaScript. The presentation introduces functional programming concepts like using functions as atomic units with known input-output behavior, immutable data to help with simplicity and parallel processing, and declarative code to make intentions clear. It also discusses how many developers may already be using functional programming techniques without realizing it when using React and its function components to render views.

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