Web Development - HTML, CSS &… on Telegram: “This concept leads directly into one of JavaScri…”

This concept leads directly into one of JavaScript's most important advanced topics: Closures. We'll cover closures separately later.

1️⃣9️⃣ Pure Functions

A pure function generally: 1. Produces the same output for the same input. 2. Doesn't modify external state.

function add(a, b) {
    return a + b;
}

Every time: add(2, 3) returns: 5. A function that depends on changing external state can behave differently. Understanding pure functions becomes particularly useful when working with modern frontend frameworks.

🧠 Real-World Example

Imagine an online shopping application.

function calculateDiscount(price, discount) {
    return price - discount;
}

function calculateTax(price, taxRate) {
    return price * taxRate;
}

let price = 2000;
let discountedPrice = calculateDiscount(price, 300);
let tax = calculateTax(discountedPrice, 0.18);

console.log(discountedPrice);
console.log(tax);

Instead of putting everything into one huge block of code, each function handles a specific responsibility.

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