1. What is the execution context and how does JavaScript run code?
Every time JavaScript code runs, it does so within an Execution Context. You can think of it as an environment that manages the code currently executing.
var a = 10; function square(num) var ans = num * num; return ans; var val1 = square(a); Use code with caution.
Copies all levels of an object, creating completely independent data structural duplicates. javascript happy rawat javascript interview questions pdf free best
Interviewers frequently test your understanding of how JavaScript works under the hood. Missing these foundational concepts can ruin an interview early on.
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✅ Core JS Concepts (Hoisting, Closures, Scope) ✅ ES6+ Modern Syntax ✅ Tricky Output-based Questions ✅ DOM Manipulation & Event Handling You can think of it as an environment
How to use it:
A closure is the combination of a function bundled together with references to its surrounding state (the lexical environment). In simple terms, a closure gives an inner function access to the outer function's scope even after the outer function has returned.
Delays execution until a certain amount of idle time has passed since the last event. Ideal for search bar auto-complete inputs. Common JavaScript Topics Covered 0
To understand JavaScript, you must first understand how the browser reads your code. JavaScript is a single-threaded, synchronous language, meaning it executes one line of code at a time in a specific order. What is the Execution Context?
These methods are used to explicitly set the this context of a function.