Javascript Interview Questions

Learn how to transform functions into reusable, smaller functions using currying and partial application.

Learn how to control function execution rates using debouncing and throttling for performance optimization.

Learn how event delegation lets you handle events efficiently by listening on a parent instead of multiple child elements.

Understand how JavaScript automatically frees memory using reachability and reference checks.

Learn how iterators define custom iteration behavior and how generators make writing them easier.

Learn what causes memory leaks in JavaScript and how to prevent them in web apps and Node.js.

Understand the difference between microtasks and macrotasks in the JavaScript event loop.

Understand the difference between shallow and deep copying, and how reference types affect data duplication.

Understand how WeakMap and WeakSet help with memory-safe key/value storage using weak references.

Learn how Web Workers enable multi-threaded behavior in JavaScript for heavy computations.

Understand the differences in scope, this binding, and syntax between arrow and traditional functions.

Learn how callback functions work and why they are essential for asynchronous programming in JavaScript.

Explore different ways to clone objects and arrays without mutating the original data.

Understand the primitive and non-primitive data types in JavaScript and how they differ.

Learn why strict equality (===) avoids unexpected type coercion in JavaScript.

Learn how JavaScript moves variable and function declarations to the top of their scope.

Learn how variable declarations differ in scope and behavior in modern JavaScript.

Understand how spread and rest operators simplify working with arrays, objects, and functions.

Master ES6 template literals for cleaner string concatenation and embedded expressions.

Learn which values evaluate to true or false in JavaScript conditionals.