🔥 Master JavaScript’s map(), filter(), and reduce() Methods (with Code Examples)

👋 Hey Devs!
If you're learning JavaScript, chances are you've come across the trio: map(), filter(), and reduce().

These array methods are powerful but can be confusing at first. In this post, I’ll break them down with clean examples you can use in your own code.

🚀 1. map() – Transform Data

const prices = [10, 20, 30];
const taxIncluded = prices.map(price => price * 1.18);
console.log(taxIncluded); // [11.8, 23.6, 35.4]

📌 Use it when you need to convert or modify array items.

🔍 2. filter() – Keep What You Need

const scores = [45, 67, 89, 34];
const passing = scores.filter(score => score >= 60);
console.log(passing); // [67, 89]

📌 Use it when you want to exclude some data.

🧮 3. reduce() – Crunch Everything

const cart = [100, 200, 50];
const total = cart.reduce((acc, curr) => acc + curr, 0);
console.log(total); // 350

📌 Use it to sum, count, or combine data.

💡 Summary
These three methods are essential for writing clean, functional JavaScript. And once you get comfortable with them, you'll reach for them in almost every project.

📖 Check out my full article with visual explanation and code breakdown:
👉 https://webcodingwithankur.blogspot.com/2025/06/javascript-map-filter-reduce-explained.html