How JavaScript objects inherit properties from one another. Understanding the Prototype Chain is a hallmark of an advanced developer. 4. ES6+ Features
The engine scans the code and allocates memory to variables and functions. Variables are initially set to undefined , and functions are stored as whole blocks.
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That prototype object has a prototype of its own, and so on until an object is reached with null as its prototype. This chain of objects is known as the . Explicit Binding: Call, Apply, and Bind
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console.log(a); // Outputs: undefined (due to hoisting) var a = 10; console.log(b); // Throws ReferenceError: Cannot access 'b' before initialization let b = 20; Use code with caution. Variables are hoisted and initialized with undefined .
JavaScript is single-threaded, meaning it executes one line of code at a time. To handle async operations (like API calls or timers), it uses the Event Loop. Executes synchronous code. ES6+ Features The engine scans the code and
Unlike traditional object-oriented languages, JavaScript uses prototypes.
== is the abstract equality operator, which performs type coercion before comparing. === is the strict equality operator, which compares both the value and the type without coercion. For example, 5 == "5" is true , but 5 === "5" is false . Q2: What is the difference between var , let , and const ?
Interviewers often ask how to use closures to create private variables or factory functions. Memorize this pattern; it demonstrates a strong grasp of memory management and encapsulation. 2. Prototypal Inheritance and the Prototype Chain
Are you preparing for a front-end, back-end, or full-stack web developer role? Passing a JavaScript interview requires more than just a basic understanding of variables and loops. It demands a deep comprehension of how the JavaScript engine works under the hood, advanced asynchronous handling, and modern ES6+ features.
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