JavaScript - Complete Guide (Beginner + Advanced)

Explore how let and const determine mutability and block scope in JavaScript. See how let allows reassignment while const cannot, and how block scope restricts access inside and outside blocks.

Explore JavaScript functions, including declarations, function expressions, and arrow functions, learn hoisting differences, and how to call with parameters.

In ES6, a class is a blueprint for objects, and its constructor is invoked when a new instance is created with new keyword; if missing, JavaScript uses an empty constructor.

Explore arrow functions in JavaScript, covering parameter syntax, implicit return for single expressions, and how they differ from regular functions that rely on the arguments object.

Learn how ES6 template literals use backticks to embed expressions with dollar signs and curly braces, enabling multi-line strings and eliminating plus-concatenation. See how they improve readability and maintainability through examples.

Learn how the this keyword behaves with arrow functions due to lexical this, inheriting from surrounding scope, and why this differs from regular functions in callbacks, event handlers, and timers.

Explore the spread operator in JavaScript to copy and merge arrays and objects, add or override properties, and create shallow copies for cleaner code.

Master array destructuring in JavaScript to unpack values, skip elements, and assign defaults. Learn to use rest and spread operators, swap variables, and destructure nested arrays and function parameters.

Learn object destructuring in JavaScript to extract properties from objects, rename variables, set default values, and handle nested objects, including using the rest operator to gather remaining properties.

Explains the rest operator in ES6, showing how to collect remaining array elements or object properties with three dots, using examples with fruits and a person object.

Master JavaScript maps as key-value collections that preserve order. Use map.set to add, map.get to retrieve, map.delete to remove, and has to check existence; iterate with forEach or for loops.

Explore JavaScript sets as a collection of unique values, learn to add with set.add, check existence with set.has, remove with set.delete, and iterate with set.forEach.

Explore the difference between synchronous and asynchronous operations in JavaScript, highlighting non-blocking execution, callbacks, promises, and delays using setTimeout and real-world examples.

Explore Object.entries and Object.values, two ES eight methods that convert objects into key-value pairs and extract values. Learn to iterate with for...of and destructuring, and transform using map with entries.

Explore setters and getters in es6 by building a rectangle class with width and height, validating width to be positive, and computing area via a getter.

Explore JavaScript modules by exporting and importing functions, constants, and objects. Learn default versus named exports, how to mix them, and share configuration data across modules with import and export.

Build a custom iterator by defining symbol.iterator on an object to yield values via next and an internal index, enabling a for loop to traverse 20, 30, and 40.

Explore getters and setters in ES6 by building a rectangle class with width and height and using a getter to compute the area, width times height.

Explore weakmap and weakset concepts by using objects as keys, performing set, get, has, and delete operations, and noting they do not prevent garbage collection or support iteration or size.

Explore generators in JavaScript, learn to define generator functions with function*, pause with yield, and resume with next to yield multiple values and signal completion with return.

Explore shared memory in JavaScript through shared array buffers and int32 arrays, and apply atomics to safely read, write, and update memory across multiple threads for high-performance concurrent apps.