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• Random Quote Generator
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• Movie Search App
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• News App using Public API
• Recipe Finder App

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🚀 JavaScript Interview Questions with Answers: Part-10

91. Write a function to find the sum of an array.

Using reduce()

function sumArray(arr) {
    return arr.reduce((total, num) => total + num, 0);
}

console.log(sumArray([1, 2, 3, 4]));

Output:
10

Using Loop

function sumArray(arr) {
    let sum = 0;

    for (let num of arr) {
        sum += num;
    }

    return sum;
}

92. Write a function to reverse a string.

Using split(), reverse(), join()

function reverseString(str) {
    return str.split("").reverse().join("");
}

console.log(reverseString("hello"));

Output:
olleh

Using Loop

function reverseString(str) {
    let reversed = "";

    for (let i = str.length - 1; i >= 0; i--) {
        reversed += str[i];
    }

    return reversed;
}

93. Write a function to find the largest number in an array.

Using Math.max()

function largestNumber(arr) {
    return Math.max(...arr);
}

console.log(largestNumber([2, 8, 5, 1]));

Output:
8

Using Loop

function largestNumber(arr) {
    let largest = arr[0];

    for (let num of arr) {
        if (num > largest) {
            largest = num;
        }
    }

    return largest;
}

94. Write a function to check if a string is a palindrome.
A palindrome reads same forward and backward.

Example:

function isPalindrome(str) {
    const reversed = str.split("").reverse().join("");
    return str === reversed;
}

console.log(isPalindrome("madam"));

Output:
true

Case-Insensitive Version

function isPalindrome(str) {
    str = str.toLowerCase();
    return str === str.split("").reverse().join("");
}

95. Write a function to remove duplicates from an array.

Using Set

function removeDuplicates(arr) {
    return [...new Set(arr)];
}

console.log(removeDuplicates([1, 2, 2, 3, 4, 4]));

Output:
[1, 2, 3, 4]

Using filter()

function removeDuplicates(arr) {
    return arr.filter((item, index) =>
        arr.indexOf(item) === index
    );
}

96. Write a function to implement debounce.
Debouncing delays execution until the user stops triggering events.

Example:

function debounce(fn, delay) {
    let timer;

    return function(...args) {
        clearTimeout(timer);

        timer = setTimeout(() => {
            fn.apply(this, args);
        }, delay);
    };
}

Usage:

``javascript
const search = debounce(() => {
console.log("Searching...");
}, 500);
``


Common Uses:
• Search bars
• Resize events
• Auto-save

97. Write a function to implement throttle.
Throttling limits execution frequency.

Example:

function throttle(fn, delay) {
    let lastCall = 0;

    return function(...args) {
        const now = Date.now();

        if (now - lastCall >= delay) {
            lastCall = now;
            fn.apply(this, args);
        }
    };
}

Usage:

``javascript
const scrollHandler = throttle(() => {
console.log("Scrolling...");
}, 1000);
``


Common Uses:
• Scroll events
• Mouse movement
• Window resizing

98. Write a function to flatten a nested array.

Using flat()

function flattenArray(arr) {
    return arr.flat(Infinity);
}

console.log(flattenArray([1, [2, [3, 4]]]));

Output:
[1, 2, 3, 4]

Recursive Solution

function flattenArray(arr) {
    let result = [];

    for (let item of arr) {
        if (Array.isArray(item)) {
            result = result.concat(flattenArray(item));
        } else {
            result.push(item);
        }
    }

    return result;
}

99. Write a function to implement a simple pub/sub pattern.

Example:

class PubSub {
    constructor() {
        this.events = {};
    }

    subscribe(event, callback) {
        if (!this.events[event]) {
            this.events[event] = [];
        }
        this.events[event].push(callback);
    }

    publish(event, data) {
        if (this.events[event]) {
            this.events[event].forEach(callback => {
                callback(data);
            });
        }
    }
}

const pubsub = new PubSub();

pubsub.subscribe("message", data => {
    console.log(data);
});

pubsub.publish("message", "Hello World");

Output:
Hello World

100. Write a function to implement a basic Promise.all.

Example:

function promiseAll(promises) {
    return new Promise((resolve, reject) => {
        let results = [];
        let completed = 0;

        promises.forEach((promise, index) => {
            Promise.resolve(promise)
                .then(result => {
                    results[index] = result;
                    completed++;

                    if (completed === promises.length) {
                        resolve(results);
                    }
                })
                .catch(reject);
        });
    });
}


promiseAll([
    Promise.resolve(1),
    Promise.resolve(2),
    Promise.resolve(3)
])
.then(console.log);

Output:
[1, 2, 3]

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JavaScript is one of the most important programming languages for:
✔ Frontend Development
✔ Backend Development
✔ Full Stack Development
✔ Mobile Apps
✔ Game Development
✔ AI & Automation

If you want to become a:
• Frontend Developer
• Full Stack Developer
• MERN Stack Developer
• JavaScript Engineer

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🧠 STEP 1: Learn JavaScript Basics
Start with the fundamentals.

Topics to Learn:
✔ Variables let, const, var
✔ Data Types
✔ Operators
✔ Type Conversion
✔ Input & Output
✔ Comments
✔ Template Literals

Practice:
let name = "Deepak";
console.log(Hello ${name});

Goal:
Understand basic syntax and write simple programs.

⚡ STEP 2: Master Conditions & Loops
Learn how to control program flow.

Topics:
✔ if/else
✔ switch
✔ Ternary Operator
✔ for Loop
✔ while Loop
✔ do-while
✔ break & continue

Practice:
for(let i = 1; i <= 5; i++) {
console.log(i);
}

Goal:
Build logic and problem-solving skills.

🛠 STEP 3: Learn Functions Deeply
Functions are the heart of JavaScript.

Topics:
✔ Function Declaration
✔ Function Expression
✔ Arrow Functions
✔ Parameters & Arguments
✔ Default Parameters
✔ Rest & Spread Operator
✔ Callback Functions
✔ Closures

Practice:
const add = (a, b) => a + b;
console.log(add(2, 3));

Goal:
Write reusable and modular code.

📦 STEP 4: Arrays & Objects
Very important for interviews and projects.

Topics:
✔ Arrays
✔ Objects
✔ Array Methods
✔ map()
✔ filter()
✔ reduce()
✔ Destructuring
✔ Object Methods

Practice:
const nums = [1, 2, 3];
const doubled = nums.map(num => num * 2);
console.log(doubled);

Goal:
Handle and manipulate data efficiently.

🔗 STEP 5: DOM Manipulation
This is where JavaScript becomes interactive.

Topics:
✔ DOM Basics
✔ Selecting Elements
✔ Changing Content
✔ Styling Elements
✔ Creating Elements
✔ Event Listeners
✔ Event Bubbling
✔ Event Delegation

Practice:
document.getElementById("btn").addEventListener("click", () => {
alert("Clicked");
});

Goal:
Build interactive websites.

🕐 STEP 6: Asynchronous JavaScript
Most important topic for interviews.

Topics:
✔ Call Stack
✔ Event Loop
✔ Callback Queue
✔ Callbacks
✔ Promises
✔ async/await
✔ Fetch API
✔ Error Handling

Practice:
async function getData() {
const response = await fetch("https://api.example.com");
const data = await response.json();
console.log(data);
}

Goal:
Understand real-world async behavior.

🏗 STEP 7: ES6+ Modern JavaScript
Modern JavaScript features are heavily used in projects.

Topics:
✔ let & const
✔ Arrow Functions
✔ Template Literals
✔ Modules
✔ Classes
✔ Optional Chaining
✔ Nullish Coalescing
✔ Destructuring

Practice:
const user = { name: "Deepak" };
console.log(user?.name);

Goal:
Write modern clean JavaScript.

🧠 STEP 8: Advanced JavaScript
This separates beginners from professionals.

Topics:
✔ Closures
✔ Hoisting
✔ this Keyword
✔ Prototype
✔ Inheritance
✔ Currying
✔ Memoization
✔ Debounce & Throttle
✔ Event Delegation
✔ Design Patterns

Practice:
function outer() {
let count = 0;
return function() {
count++;
console.log(count);
};
}

Goal:
Understand JavaScript internally.

🌐 STEP 9: Learn Browser APIs
Important for frontend development.

Topics:
✔ Local Storage
✔ Session Storage
✔ Geolocation API
✔ Fetch API
✔ Clipboard API
✔ Drag & Drop API

Goal:
Build powerful browser applications.

⚛ STEP 10: Learn a Frontend Framework
After JavaScript basics, move to frameworks.

Best Choice:
✔ React

Then Learn:
✔ Components
✔ Props
✔ State
✔ Hooks  
✔ Routing  
✔ API Integration  

Goal:  
Build modern frontend apps.

🖥 STEP 11: Learn Backend JavaScript
Use JavaScript on the server side.

Learn:
✔ Node.js
✔ Express
✔ REST APIs
✔ Authentication
✔ Middleware

Goal:
Become Full Stack Developer.

🗄 STEP 12: Learn Databases
Databases to Learn:
✔ MongoDB
✔ MySQL
✔ PostgreSQL

Topics:
✔ CRUD Operations
✔ Relationships
✔ Queries
✔ Aggregation

🚀 STEP 13: Build Real Projects
Projects are the fastest way to learn.

Beginner Projects:
✔ Calculator
✔ To-Do App
✔ Weather App
✔ Quiz App

Intermediate Projects:
✔ Expense Tracker
✔ Chat App
✔ Movie App

Advanced Projects:
✔ E-commerce Website
✔ Social Media App
✔ Full Stack Dashboard

🧩 STEP 14: Learn Tools & Ecosystem
Important Tools:
✔ Git
✔ GitHub
✔ Webpack
✔ Vite
✔ npm

📚 STEP 15: Practice DSA & Interview Questions
Practice:
✔ Arrays
✔ Strings
✔ Recursion
✔ Stack & Queue
✔ Linked List
✔ Sorting
✔ Searching

Platforms:
LeetCode
HackerRank
CodeWars

🎯 Focus More On:
🔥 Closures
🔥 Async JavaScript
🔥 Event Loop
🔥 DOM Manipulation
🔥 ES6+ Features
🔥 Projects
🔥 API Handling

🚀 Suggested Learning Order
1. JavaScript Basics
2. Functions
3. Arrays & Objects
4. DOM Manipulation
5. Async JavaScript
6. ES6+
7. Advanced Concepts
8. React
9. Node.js
10. Databases
11. Full Stack Projects

💡 Best Way to Learn JavaScript
✅ Learn concept
✅ Write code
✅ Build mini project
✅ Solve problems
✅ Revise regularly
✅ Teach others
✅ Build portfolio projects

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