Coding Master
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*Typical C++ interview questions sorted by experience*

Junior:
- What are the key features of object-oriented programming in C++?
- Explain the differences between public, private, and protected access specifiers in C++.
- Distinguish between function overloading and overriding in C++.
- Compare and contrast abstract classes and interfaces in C++.
- Can an interface inherit from another interface in C++?
- Define the static keyword in C++ and its significance.
- Is it possible to override a static method in C++?
- Explain the concepts of polymorphism and inheritance in C++.
- Can constructors be inherited in C++?
- Discuss pass-by-reference and pass-by-value for objects in C++.
- Compare == and .equals for string comparison in C++.
- Explain the purposes of the hashCode() and equals() functions.
- What does the Serializable interface do? How is it related to Parcelable in Android?
- Differentiate between Array and ArrayList in C++. When would you use each?
- Explain the distinction between Integer and int in C++.
- Define ThreadPool and discuss its advantages over using simple threads.
- Differentiate between local, instance, and class variables in C++.

Mid:
- What is reflection in C++?
- Define dependency injection and name a few libraries. Have you used any?
- Explain strong, soft, and weak references in C++.
- Interpret the meaning of the synchronized keyword.
- Can memory leaks occur in C++?
- Is it necessary to set references to null in C++?
- Why is a String considered immutable?
- Discuss transient and volatile modifiers in C++.
- What is the purpose of the finalize() method?
- How does the try{} finally{} block work in C++?
- Explain the difference between object instantiation and initialization.
- Under what conditions is a static block executed in C++?
- Why are generics used in C++?
- Mention some design patterns you are familiar with. Which do you typically use?
- Name some types of testing methodologies in C++.

Senior:
- Explain how std::stoi (string to integer) works in C++.
- What is the "double-check locking" problem, and how can it be solved in C++?
- Differentiate between StringBuffer and StringBuilder in C++.
- How is StringBuilder implemented to avoid the immutable string allocation problem?
- Explain the purpose of the Class.forName method in C++.
- Define Autoboxing and Unboxing in C++.
- What's the difference between Enumeration and Iterator in C++?
- Explain the difference between fail-fast and fail-safe in C++.
- What is PermGen in C++?
- Describe a Java priority queue.
- How is performance influenced by using the same number in different types: Int, Double, and Float?
- Explain the concept of the Java Heap.
- What is a daemon thread?
- Can a dead thread be restarted in C++?

*React โค๏ธ for more*
*10 professional-level JavaScript interview questions with answers:*

*1. What is the difference between var, let, and const?*

var is function-scoped and can be hoisted.

let and const are block-scoped and not hoisted like var.

const cannot be reassigned after declaration.


var a = 10;
let b = 20;
const c = 30;

*2. What is a closure in JavaScript?*

A closure is a function that retains access to its lexical scope even after the outer function has finished executing.

function outer() {
let count = 0;
return function inner() {
count++;
return count;
};
}

const counter = outer();
counter(); // 1
counter(); // 2


*3. How does the JavaScript event loop work?*

The event loop handles async tasks by pushing them into the call stack only when it's empty. Microtasks (like Promises) are prioritized over macrotasks (like setTimeout).


*4. Explain this keyword in JavaScript.*

this refers to the context in which a function is called.

In a method: this refers to the object.

In a regular function: this refers to window (in non-strict mode).

In arrow functions: this is lexically inherited.



*5. What is the difference between == and ===?*

== checks for value equality (type coercion).

=== checks for strict equality (no type coercion).


'5' == 5 // true
'5' === 5 // false


*6. What is event delegation?*

Event delegation is a technique where a single event listener is added to a parent element to handle events on its child elements.

document.getElementById("list").addEventListener("click", function(e) {
if (e.target.tagName === "LI") {
console.log("List item clicked:", e.target.textContent);
}
});


*7. What is the difference between null and undefined?*

undefined: a variable declared but not assigned a value.

null: an assignment value representing no value.


let a;
console.log(a); // undefined
let b = null;
console.log(b); // null


*8. What is a Promise and how do async/await work?*

A Promise represents the eventual result of an asynchronous operation.
async/await make asynchronous code look synchronous.

async function getData() {
let result = await fetch('https://api.example.com');
let data = await result.json();
console.log(data);
}


*9. What is prototypal inheritance?*

JavaScript objects inherit properties and methods from a prototype object.

function Person(name) {
this.name = name;
}
Person.prototype.sayHi = function() {
return Hi, I'm ${this.name};
};


*10. What is debouncing in JavaScript?*

Debouncing limits the rate at which a function is executed, waiting for a pause in activity.

function debounce(fn, delay) {
let timer;
return function(...args) {
clearTimeout(timer);
timer = setTimeout(() => fn.apply(this, args), delay);
};
}


*React โค๏ธ for more*
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Don't overwhelm to learn JavaScript, JavaScript is only this much

1.Variables
โ€ข var
โ€ข let
โ€ข const

2. Data Types
โ€ข number
โ€ข string
โ€ข boolean
โ€ข null
โ€ข undefined
โ€ข symbol

3.Declaring variables
โ€ข var
โ€ข let
โ€ข const

4.Expressions
Primary expressions
โ€ข this
โ€ข Literals
โ€ข []
โ€ข {}
โ€ข function
โ€ข class
โ€ข function*
โ€ข async function
โ€ข async function*
โ€ข /ab+c/i
โ€ข string
โ€ข ( )

Left-hand-side expressions
โ€ข Property accessors
โ€ข ?.
โ€ข new
โ€ข new .target
โ€ข import.meta
โ€ข super
โ€ข import()

5.operators
โ€ข Arithmetic Operators: +, -, *, /, %
โ€ข Comparison Operators: ==, ===, !=, !==, <, >, <=, >=
โ€ข Logical Operators: &&, ||, !

6.Control Structures
โ€ข if
โ€ข else if
โ€ข else
โ€ข switch
โ€ข case
โ€ข default

7.Iterations/Loop
โ€ข do...while
โ€ข for
โ€ข for...in
โ€ข for...of
โ€ข for await...of
โ€ข while

8.Functions
โ€ข Arrow Functions
โ€ข Default parameters
โ€ข Rest parameters
โ€ข arguments
โ€ข Method definitions
โ€ข getter
โ€ข setter

9.Objects and Arrays
โ€ข Object Literal: { key: value }
โ€ข Array Literal: [element1, element2, ...]
โ€ข Object Methods and Properties
โ€ข Array Methods: push(), pop(), shift(), unshift(),
splice(), slice(), forEach(), map(), filter()

10.Classes and Prototypes
โ€ข Class Declaration
โ€ข Constructor Functions
โ€ข Prototypal Inheritance
โ€ข extends keyword
โ€ข super keyword
โ€ข Private class features
โ€ข Public class fields
โ€ข static
โ€ข Static initialization blocks

11.Error Handling
โ€ข try,
โ€ข catch,
โ€ข finally (exception handling)

ADVANCED CONCEPTS

12.Closures
โ€ข Lexical Scope
โ€ข Function Scope
โ€ข Closure Use Cases

13.Asynchronous JavaScript
โ€ข Callback Functions
โ€ข Promises
โ€ข async/await Syntax
โ€ข Fetch API
โ€ข XMLHttpRequest

14.Modules
โ€ข import and export Statements (ES6 Modules)
โ€ข CommonJS Modules (require, module.exports)

15.Event Handling
โ€ข Event Listeners
โ€ข Event Object
โ€ข Bubbling and Capturing

16.DOM Manipulation
โ€ข Selecting DOM Elements
โ€ข Modifying Element Properties
โ€ข Creating and Appending Elements

17.Regular Expressions
โ€ข Pattern Matching
โ€ข RegExp Methods: test(), exec(), match(), replace()

18.Browser APIs
โ€ข localStorage and sessionStorage
โ€ข navigator Object
โ€ข Geolocation API
โ€ข Canvas API

19.Web APIs
โ€ข setTimeout(), setInterval()
โ€ข XMLHttpRequest
โ€ข Fetch API
โ€ข WebSockets

20.Functional Programming
โ€ข Higher-Order Functions
โ€ข map(), reduce(), filter()
โ€ข Pure Functions and Immutability

21.Promises and Asynchronous Patterns
โ€ข Promise Chaining
โ€ข Error Handling with Promises
โ€ข Async/Await

22.ES6+ Features
โ€ข Template Literals
โ€ข Destructuring Assignment
โ€ข Rest and Spread Operators
โ€ข Arrow Functions
โ€ข Classes and Inheritance
โ€ข Default Parameters
โ€ข let, const Block Scoping

23.Browser Object Model (BOM)
โ€ข window Object
โ€ข history Object
โ€ข location Object
โ€ข navigator Object

24.Node.js Specific Concepts
โ€ข require()
โ€ข Node.js Modules (module.exports)
โ€ข File System Module (fs)
โ€ข npm (Node Package Manager)

25.Testing Frameworks
โ€ข Jasmine
โ€ข Mocha
โ€ข Jest

*React โค๏ธ for more*
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