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).

: Say goodbye to NullPointerException . The Option[T] container forces you to explicitly handle cases where a value might be missing ( Some(value) or None ). 3. Practical Example: From Impure to Pure Functional Programming in Scala

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 : A function is "pure" if it always

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): Instead of modifying a list

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

: Once a value is created, it never changes. Instead of modifying a list, you create a new one with the desired changes. This eliminates entire classes of bugs related to shared mutable state.