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Introduction to TanStack Query

TanStack Query (formerly known as React Query) is a data-fetching library for web applications, but in more technical terms, it makes fetching, caching, synchronizing and updating server state in your web applications a breeze.

Higher-Order Functions

Learn higher-order functions in JavaScript. Understand functions that accept or return other functions, create reusable abstractions, and write cleaner code.

DOM Manipulation: How Browsers Represent Web Pages

Learn the DOM in JavaScript. Select and manipulate elements, traverse nodes, handle events, and optimize rendering performance.

Recursion: Functions That Call Themselves

Learn recursion in JavaScript. Understand base cases, recursive calls, the call stack, and patterns like factorial, tree traversal, and memoization.

JavaScript Engines: How V8 Runs Your Code

Learn how JavaScript engines work. Understand V8's parsing, JIT compilation, hidden classes, inline caching, and garbage collection.

IIFE, Modules & Namespaces: Structuring Code

Learn how to organize JavaScript code with IIFEs, namespaces, and ES6 modules. Understand private scope, exports, dynamic imports, and common module mistakes.

JavaScript Event Loop Explained

Learn how the JavaScript event loop handles async code. Understand the call stack, task queue, microtasks, and why Promises always run before setTimeout().

Scope & Closures

Learn JavaScript scope and closures. Understand the three types of scope, var vs let vs const, lexical scoping, the scope chain, and closure patterns for data privacy.

Al-Hussein

26 min read

March 5, 2026