A Guide To Functional Programming

How do you handle necessary side effects like API calls while keeping your core logic pure and testable?

#1about 2 minutes

Core principles of functional programming

Functional programming builds programs using pure functions, immutable values, and higher-order functions to minimize side effects.

#2about 2 minutes

Benefits of adopting a functional paradigm

Writing functional code leads to more readable, testable, and reusable programs while avoiding common issues like `this` context in JavaScript.

#3about 2 minutes

Writing functional JavaScript with React components

Transitioning from class components to functional components with hooks is a practical example of applying functional principles in a JavaScript application.

#4about 3 minutes

Understanding and writing pure functions

A pure function always returns the same output for the same input and avoids dependency on global variables to ensure predictable results.

#5about 2 minutes

Maintaining immutability in JavaScript

Avoid mutating original data structures like arrays by using techniques such as the spread operator to create new instances.

#6about 1 minute

Using higher-order functions for clean code

Higher-order functions like map and reduce process data structures without mutating the original value, leading to safer and more declarative code.

#7about 1 minute

Identifying and minimizing side effects

Side effects are any changes outside a function's return value, such as logging or mutating global variables, which should be minimized.

#8about 2 minutes

Real-world applications of functional programming

Functional principles are applied in modern development through tools like React functional components, Redux reducers, and atomic design systems.

#9about 4 minutes

Managing necessary side effects in applications

Handle unavoidable side effects like API calls, logging, and routing by isolating them using middleware patterns like Redux epics or observables.

#10about 6 minutes

Audience Q&A on functional programming concepts

The speaker answers audience questions about organizing large functional codebases, the cons of FP, using libraries like Immutable.js, and performance implications.