Functional Programming In Scala [FAST]

To write functional Scala, you need to master three fundamental concepts:

def buyCoffee(cc: CreditCard): Coffee = val cup = new Coffee() cc.charge(cup.price) // Side effect: hits the bank API immediately cup Use code with caution. Copied to clipboard Learning Functional Programming with Scala | by Ryan Susana

Scala provides several built-in tools that make functional patterns elegant and concise: Functional Programming in Scala

: A function is "pure" if it always returns the same output for the same input and has no side effects (like printing to a console or updating a database).

Consider a simple task: buying a coffee. In a standard imperative style, you might have a side effect where the credit card is charged immediately. In a functional style, you return the charge as a to be processed later. Impure Code (Side Effect): To write functional Scala, you need to master

Functional Programming (FP) in Scala isn't just about using a different syntax—it’s about changing how you think about problems. By treating programs as a series of mathematical transformations rather than a sequence of changes to a shared state, you can write code that is more reliable, easier to test, and naturally thread-safe. 1. The Core Pillars of Scala FP

: This means you can replace a function call with its resulting value without changing the program's behavior. This makes reasoning about complex code much simpler. 2. Powerful Scala Features for FP In a standard imperative style, you might have

: In Scala, functions are first-class citizens. You can pass them as arguments to other functions (like map , filter , or flatmap ) or return them as values.