Happy Rawat Javascript Interview Questions Pdf Free Upd Verified

It checks if the property exists directly on the object itself. If it is not found, it looks at the object's prototype.

What is a closure? Provide an example of its usage.

Array Flattening: Write a function to flatten a nested array without using .flat() .

: Understand the differences between var , let , and const . Master the 8 data types: String, Number, BigInt, Boolean, Undefined, Null, Symbol, and Object. happy rawat javascript interview questions pdf free upd

A closure is the combination of a function bundled together with references to its surrounding state—the . In simple terms, a closure gives an inner function access to the outer function’s scope even after the outer function has finished executing and its execution context has been popped off the Call Stack.

JavaScript is a single-threaded, synchronous language. Every time a script runs, the engine creates a . When a function is invoked, a new Function Execution Context (FEC) is created and pushed onto the Call Stack .

Using ?. and ?? effectively.

What you are targeting (Junior, Mid-level, or Senior/Staff)?

Master execution contexts, call stacks, scope chains, and closure mechanics.

Created by default when your script starts executing. It checks if the property exists directly on

When asynchronous operations (like setTimeout or fetch ) complete, their callbacks are placed into queues:

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function debounce(func, delay) let timer; return function(...args) const context = this; clearTimeout(timer); timer = setTimeout(() => func.apply(context, args); , delay); ; Use code with caution. Implementation of Throttle: javascript Provide an example of its usage