Functional Programming
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How to Flatten Deeply Nested Arrays in JavaScript
From simple recursion to powerful ES2025 tricks Introduction You’ve probably run into this before: const nested = [1, [2, [3, [4, 5]]]]; Now you want: [1, 2, 3, 4, 5] Flattening arrays sounds trivial… until you see the many ways to do it in JavaScript. Should you use recursion? reduce? A built-in method like .flat()? Or go…
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Using find and findIndex in JavaScript
Practical patterns, type-safe predicates, immutable updates, and performance traps you’ll actually hit in real projects. Introduction Grabbing “the one item I care about” is a daily task: the logged-in user, the selected tab, the matching route, the product to update. Many developers still reach for loops or misuse indexOf for objects—leading to brittle code and…
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map, reduce, filter in JavaScript: Stop Using Loops for Everything
A practical, copy-paste guide to expressive, bug-resistant data transformations in modern JavaScript — with real-world patterns, performance notes, and when loops still win. Introduction If you’re still writing every transformation with for loops, you’re doing extra work. You’re manually pushing, mutating, and juggling state that JavaScript can handle for you—more clearly and safely. The trio of map, filter,…
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bind, call, and apply Made Simple
How to control this in JavaScript without losing your mind. Introduction Few things confuse JavaScript developers more than this. It behaves differently depending on how a function is called. To make matters worse, we also have three helpers—bind, call, and apply—that let us manually control this. Good news: these aren’t magic. Once you see the patterns,…
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Function Currying: Fun & Practical
How to break functions into bite-sized calls for flexibility, reuse, and clarity in JavaScript. Introduction At first glance, function currying feels like one of those “fancy functional programming ideas” that you’ll never actually use in day-to-day development. But once you understand it, you’ll see it everywhere — from event handlers to config builders to React hooks. Currying…
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Pure Functions vs. Impure Functions: Real Examples
A practical guide to understanding purity in JavaScript, with real-world code and why it matters for maintainable, testable apps. Introduction “Pure functions” get thrown around in every functional programming discussion, but many developers wonder: What actually makes a function pure? And why should I care when building apps? Here’s the simple truth: pure functions are predictable,…
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