Forem: Akshaya Mallyar Shet

Comparing Vue's Composition API and Options API

Akshaya Mallyar Shet — Tue, 23 Sep 2025 05:06:55 +0000

Vue.js is a popular front-end framework known for its flexibility and ease of use. With the release of Vue 3, a new feature called the Composition API was introduced, offering a different way to organize and reuse code within Vue components. In this article, we will compare the Vue Composition API with the traditional Options API, providing examples to illustrate the differences between the two.

Options API

The Options API has been the primary way of creating Vue components in versions 2.x and earlier. It is based on defining options such as data, methods, computed properties, and lifecycle hooks within a component object. Here's an example of a simple counter component using the Options API:

// Options API
<template>
  <div>
    <p>{{ count }}</p>
    <button @click="increment">Increment</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      count: 0
    };
  },
  methods: {
    increment() {
      this.count++;
    }
  }
};
</script>

Composition API

The Composition API is a new addition to Vue 3, and it provides an alternative way of organizing code by allowing logic to be grouped based on functionality rather than by options. Here's the same counter component created using the Composition API:

// Composition API
<template>
  <div>
    <p>{{ count }}</p>
    <button @click="increment">Increment</button>
  </div>
</template>

<script>
import { ref } from 'vue';

export default {
  setup() {
    const count = ref(0);
    const increment = () => {
      count.value++;
    };

    return {
      count,
      increment
    };
  }
};
</script>

Differences and Use Cases

Now, let's discuss the differences and use cases for each API.

Options API:

Well-suited for smaller components with simple logic.
Clear separation of concerns between different options of a component.
Familiar to developers with experience in Vue 2.x and earlier versions.

Composition API:

Provides a more flexible and scalable way to organize and reuse code within components.
Encourages reusability of logic through composition functions.
Especially useful for larger and more complex components where grouping related logic together is beneficial.

Conclusion

In conclusion, both the Options API and Composition API are valid approaches to building Vue components, and the choice between the two largely depends on the specific requirements of a given project. While the Options API remains a familiar and effective way to develop Vue components, the Composition API offers more flexibility and better organization, especially for larger and more complex components.

By providing a better way to manage and reuse code, the Composition API can lead to more maintainable and readable Vue components as projects grow in size and complexity.

I hope this article helps clarify the differences between the two APIs and provides insight into when to use each. If you have any questions or would like further clarification, feel free to reach out. Thank you for reading, and happy coding!

Understanding the Differences Between Vue 2 and Vue 3

Akshaya Mallyar Shet — Wed, 05 Feb 2025 10:11:09 +0000

Vue.js has become one of the most popular frameworks for building user interfaces, thanks to its flexibility and ease of use. With the release of Vue 3, it brought several significant improvements and innovations over Vue 2. In this blog post, we'll delve into the key differences between Vue 2 and Vue 3, along with examples to illustrate these changes.

1. Composition API vs. Options API

Vue 2: Options API

In Vue 2, we primarily worked with the Options API, which organizes code by options like data, methods, computed, watch, and lifecycle hooks. This structure is clear and easy for simple components but can become cumbersome in larger applications.

Example:

new Vue({
  el: '#app',
  data() {
    return {
      count: 0
    };
  },
  methods: {
    increment() {
      this.count++;
    }
  }
});

Vue 3: Composition API

Vue 3 introduced the Composition API, which allows for more flexible code organization and better reusability. It helps to manage complex components by grouping related logic together.

Example:

import { createApp, ref } from 'vue';

const App = {
  setup() {
    const count = ref(0);
    const increment = () => {
      count.value++;
    };

    return { count, increment };
  }
};

createApp(App).mount('#app');

Key Takeaway

The Composition API promotes a more functional approach, making it easier to share and reuse logic across components.

2. Performance Improvements

Vue 3 was built with performance in mind. The framework is faster due to optimizations like:

Virtual DOM rewriting for better rendering performance.
Smaller bundle sizes thanks to tree-shaking.
Improved response times with a more efficient reactivity system.

Example

While specific performance metrics can vary based on the application, you can generally expect Vue 3 to handle larger applications more efficiently. Benchmarks show that Vue 3 renders around 25-55% faster than Vue 2 in many scenarios.

3. TypeScript Support

Vue 2: Limited TypeScript Support

While TypeScript could be used in Vue 2, it often felt like an afterthought. The integration was not seamless, and many developers faced challenges.

Vue 3: First-Class TypeScript Support

Vue 3 was rewritten in TypeScript, providing better type inference and enhancing overall developer experience. It allows you to leverage the benefits of TypeScript seamlessly.

Example:

import { defineComponent, ref } from 'vue';

export default defineComponent({
  setup() {
    const message = ref<string>('Hello, Vue 3 with TypeScript!');

    return { message };
  }
});

Key Takeaway

The improved TypeScript support in Vue 3 enables developers to create more robust applications with fewer runtime errors.

4. Reactivity System

Vue 2: Object-based Reactivity

In Vue 2, the reactivity system is based on Object.defineProperty(), which can lead to some limitations, such as difficulties in detecting property additions/deletions.

Vue 3: Proxy-based Reactivity

Vue 3 uses the native Proxy object, offering a more powerful and flexible reactivity system. This allows for better performance and eliminates many of the limitations of Vue 2’s reactivity system.

Example:

import { reactive } from 'vue';

const state = reactive({
  count: 0
});

state.count++; // Reactive update detected automatically

Key Takeaway

The new reactivity system in Vue 3 allows for easier and more intuitive state management and supports edge cases like dynamic properties without special methods.

5. Fragments

Vue 2: Single Root Node

In Vue 2, every component had to have a single root node. This limitation could lead to unnecessary markup in templates.

Vue 3: Support for Multiple Root Nodes

Vue 3 allows components to have multiple root nodes, enabling cleaner and more semantic template structures.

Example:

const App = {
  setup() {
    return () => (
      <>
        <h1>Hello Vue 3</h1>
        <p>This component can have multiple root nodes.</p>
      </>
    );
  }
};

Key Takeaway

Multiple root nodes enable more intuitive component declarations, improving the structure of the rendered DOM.

Conclusion

Vue 3 introduces several significant changes that enhance performance, usability, and scalability compared to Vue 2. The Composition API empowers developers with better organization of code, while improved TypeScript support and a new reactivity system pave the way for building more robust applications.

As you migrate to Vue 3 or start new projects, keep these differences in mind to leverage the full potential of the framework. Happy coding!

25 JavaScript Concept Interview Questions with Examples

Akshaya Mallyar Shet — Wed, 06 Nov 2024 15:48:06 +0000

JavaScript has become one of the most popular programming languages in the world, powering everything from web applications to server-side development. As a JavaScript developer, understanding key concepts is essential not only for building applications but also for acing interviews. In this blog, we will cover 25 important JavaScript interview questions along with examples to illustrate their application.

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

var is function-scoped and can be redeclared.
let is block-scoped and cannot be redeclared in the same block.
const is also block-scoped but cannot be reassigned.

var a = 1;
let b = 2;
const c = 3;

if (true) {
    var a = 4; // Same variable
    let b = 5; // Scoped to block
    // const c = 6; // Error: variable c is already declared
}
console.log(a); // 4
console.log(b); // 2
// console.log(c); // Error: c is not defined

2. What is hoisting?

Hoisting is the behavior in JavaScript where variable declarations are moved to the top of their scope during compilation. Only the declarations are hoisted, not the initializations.

console.log(x); // undefined
var x = 5;

3. Explain closures.

A closure is a function that remembers its lexical scope even when the function is executed outside that scope. Closures allow for data encapsulation.

function outer() {
    let count = 0;
    return function inner() {
        count++;
        return count;
    };
}
const increment = outer();
console.log(increment()); // 1
console.log(increment()); // 2

4. What are promises?

A Promise is an object that represents the eventual completion (or failure) of an asynchronous operation and its resulting value.

const myPromise = new Promise((resolve, reject) => {
    setTimeout(() => {
        resolve("Done!");
    }, 1000);
});
myPromise.then(result => console.log(result)); // "Done!" after 1 second

5. What is async/await?

Async/await is syntactic sugar built on top of Promises. The async function returns a promise, and await pauses the execution of the function until the promise is resolved.

async function fetchData() {
    const response = await fetch('https://api.example.com/data');
    const data = await response.json();
    return data;
}

6. What are arrow functions?

Arrow functions allow for a more concise syntax when writing function expressions. They also lexically bind the this value.

const add = (x, y) => x + y;
console.log(add(2, 3)); // 5

7. Explain the `this` keyword.

The value of this indicates the object that is executing the current function. Its value can vary based on how the function is called.

const obj = {
    value: 10,
    getValue: function() {
        return this.value;
    }
};
console.log(obj.getValue()); // 10

8. What is the event loop?

The event loop handles asynchronous calls in JavaScript, allowing non-blocking execution of code. It continuously checks the call stack and the message queue.

console.log("1");
setTimeout(() => console.log("2"), 0);
console.log("3");
// Output: 1, 3, 2

9. What is the difference between `==` and `===`?

== is a loose equality operator that checks for equality after performing type coercion. === is a strict equality operator that checks for equality without type coercion.

console.log(0 == '0');  // true
console.log(0 === '0'); // false

10. What is the purpose of the `bind` method?

bind creates a new function that, when called, has its this keyword set to the provided value, allowing you to set the context.

const obj = { value: 42 };
const getValue = function() {
    return this.value;
};
const boundGetValue = getValue.bind(obj);
console.log(boundGetValue()); // 42

11. Explain prototypal inheritance.

Prototypal inheritance is a feature in JavaScript that allows objects to inherit properties and methods from other objects. It's achieved via the prototype property.

const animal = {
    eats: true
};
const rabbit = Object.create(animal);
console.log(rabbit.eats); // true

12. What are modules in JavaScript?

Modules are reusable pieces of code that can be exported from one file and imported into another. They help in organizing and encapsulating code.

// module.js
export const pi = 3.14;

// main.js
import { pi } from './module.js';
console.log(pi); // 3.14

13. What is the spread operator?

The spread operator (...) allows an iterable, such as an array, to be expanded in places where zero or more arguments or elements are expected.

const arr1 = [1, 2, 3];
const arr2 = [...arr1, 4, 5];
console.log(arr2); // [1, 2, 3, 4, 5]

14. What is destructuring?

Destructuring is a syntax that allows unpacking values from arrays or properties from objects into distinct variables.

const user = { name: 'Alice', age: 25 };
const { name, age } = user;
console.log(name); // Alice

15. What is a higher-order function?

A higher-order function is a function that takes another function as an argument or returns a function as its result.

function greet(fn) {
    return fn();
}
greet(() => "Hello!"); // "Hello!"

16. What is the difference between synchronous and asynchronous programming?

Synchronous programming executes tasks sequentially, while asynchronous programming allows tasks to be executed concurrently, improving performance.

console.log("Start");
setTimeout(() => console.log("Async"), 0);
console.log("End");
// Output: Start, End, Async

17. What is a callback function?

A callback function is a function passed into another function as an argument, executed after some operation is complete.

function fetchData(callback) {
    setTimeout(() => {
        callback("Data received");
    }, 1000);
}
fetchData(data => console.log(data)); // "Data received" after 1 second

18. What is the `instanceof` operator?

instanceof is used to check if an object is an instance of a specific constructor or class.

function Person() {}
const person = new Person();
console.log(person instanceof Person); // true

19. What is the purpose of `setTimeout` and `setInterval`?

setTimeout executes a function after a specified delay.
setInterval repeatedly calls a function at specified intervals until cleared.

setTimeout(() => console.log("Executed after 1 second"), 1000);
const intervalId = setInterval(() => console.log("Executed every second"), 1000);
// clearInterval(intervalId); // To stop the interval

20. What are JavaScript data types?

JavaScript has 7 primitive data types: Undefined, Null, Boolean, Number, BigInt, String, and Symbol.

let name = "Alice"; // String
let age = 30;       // Number
let isStudent = false; // Boolean

21. What is a template literal?

Template literals are string literals allowing embedded expressions, using backticks for formatting.

const name = 'Alice';
const greeting = `Hello, ${name}!`;
console.log(greeting); // Hello, Alice!

22. What is a wrapper object?

Wrapper objects allow primitive values to be treated as objects. They enable access to methods associated with the primitive data type.

const string = new String("Hello");
console.log(string.length); // 5

23. Explain the difference between `slice` and `splice`.

slice returns a shallow copy of a portion of an array.
splice changes the contents of an array by removing or replacing existing elements.

const arr = [1, 2, 3, 4, 5];
const sliced = arr.slice(1, 4); // [2, 3, 4]
arr.splice(1, 2); // Removes 2 elements starting from index 1
console.log(arr); // [1, 4, 5]

24. What is the difference between synchronous and asynchronous functions?

Synchronous functions block execution until they complete.
Asynchronous functions allow other operations to continue during their execution.

function synchronousFunction() {
    console.log("Synchronous Execution");
}

async function asynchronousFunction() {
    console.log("Asynchronous Execution");
    await new Promise(resolve => setTimeout(resolve, 1000));
    console.log("Continuing after 1 second");
}

synchronousFunction();
asynchronousFunction();

25. What is JSON?

JSON (JavaScript Object Notation) is a lightweight data interchange format easy for humans to read and write and machines to parse and generate.

const jsonData = '{"name": "Alice", "age": 25}';
const user = JSON.parse(jsonData);
console.log(user.name); // Alice

Conclusion

Mastering these 25 JavaScript concepts will not only prepare you for technical interviews but also help you become a more proficient developer. Keep practicing, and ensure you understand the underlying principles, as these will serve you well in your coding career!

Minting JWT Token Using Node.js

Akshaya Mallyar Shet — Fri, 27 Sep 2024 09:52:13 +0000

JSON Web Tokens (JWT) are a popular method for securely transmitting information between parties as a JSON object. In this technical blog post, we will explore how to mint JWT tokens using Node.js, along with code examples to illustrate the process.

Step 1: Install the jsonwebtoken Package

Before we begin, we need to install the jsonwebtoken package, which simplifies the creation and verification of JWTs in Node.js. Open your terminal and run the following npm command to install the package:

npm install jsonwebtoken

Step 2: Create a Node.js Script to Mint JWT Tokens

Once the jsonwebtoken package is installed, we can create a simple Node.js script to mint a JWT token. Below is an example demonstrating how to achieve this:

// Import the jsonwebtoken package
const jwt = require('jsonwebtoken');

// Sample user data
const user = {
  id: 123,
  username: 'example_user'
};

// Secret key for signing the token
const secretKey = 'your_secret_key';

// Minting JWT token
const token = jwt.sign(user, secretKey, { expiresIn: '1h' });

console.log('Minted JWT token:', token);

In the above code, we first import the jsonwebtoken package and define some sample user data along with a secret key for signing the token. We then use the jwt.sign method to mint the JWT token, passing in the user data, secret key, and an optional expiration time.

Step 3: Execute the Script

Save the above code in a file, for example mint-jwt.js, and execute the script using Node.js:

node mint-jwt.js

Upon executing the script, the minted JWT token will be displayed in the console.

Conclusion

In this blog post, we covered the process of minting JWT tokens using Node.js. We installed the jsonwebtoken package, created a simple Node.js script to mint a JWT token, and executed the script to observe the generated token.

JWTs have become a standard for token-based authentication and are widely used in web development. Understanding how to mint JWT tokens is essential for implementing secure authentication mechanisms in Node.js applications.

I hope this blog post provides you with a foundational understanding of minting JWT tokens using Node.js and equips you with the knowledge to integrate JWT-based authentication in your applications.

Minting JWT Token Using Node.js

Akshaya Mallyar Shet — Fri, 27 Sep 2024 09:52:13 +0000

Step 1: Install the jsonwebtoken Package

npm install jsonwebtoken

Step 2: Create a Node.js Script to Mint JWT Tokens

Once the jsonwebtoken package is installed, we can create a simple Node.js script to mint a JWT token. Below is an example demonstrating how to achieve this:

// Import the jsonwebtoken package
const jwt = require('jsonwebtoken');

// Sample user data
const user = {
  id: 123,
  username: 'example_user'
};

// Secret key for signing the token
const secretKey = 'your_secret_key';

// Minting JWT token
const token = jwt.sign(user, secretKey, { expiresIn: '1h' });

console.log('Minted JWT token:', token);

Step 3: Execute the Script

Save the above code in a file, for example mint-jwt.js, and execute the script using Node.js:

node mint-jwt.js

Upon executing the script, the minted JWT token will be displayed in the console.

Conclusion

I hope this blog post provides you with a foundational understanding of minting JWT tokens using Node.js and equips you with the knowledge to integrate JWT-based authentication in your applications.

Introducing Vue 3: Exploring Its New Features with Examples

Akshaya Mallyar Shet — Wed, 17 Jul 2024 07:01:23 +0000

Vue 3, the latest iteration of the popular JavaScript framework, comes with several exciting features and improvements that enhance its capabilities for building modern web applications. In this technical blog post, we'll delve into some of the key features introduced in Vue 3 and provide examples to illustrate their usage.

1. Composition API:
Vue 3 introduces the Composition API, which offers a new way to organize and reuse logic across components. Let's take a look at a simple example of using the Composition API to fetch and display data in a Vue 3 component:

import { ref, onMounted } from 'vue';

export default {
  setup() {
    const data = ref([]);

    onMounted(async () => {
      const response = await fetch('https://api.example.com/data');
      data.value = await response.json();
    });

    return {
      data
    };
  }
};

In this example, we use the ref function to declare reactive data and the onMounted lifecycle hook to fetch data when the component is mounted. This demonstrates how the Composition API allows for more streamlined organization and reuse of component logic.

2. Teleport:
The new Teleport feature in Vue 3 allows developers to render a component's children at a different place in the document hierarchy. Let's consider an example of using Teleport to create a modal dialog in Vue 3:

<template>
  <teleport to="body">
    <div v-if="showModal" class="modal">
      <h2>Modal Dialog</h2>
      <p>This is a modal dialog rendered outside the current DOM hierarchy.</p>
    </div>
  </teleport>
</template>

<script>
import { ref } from 'vue';

export default {
  setup() {
    const showModal = ref(false);

    return {
      showModal
    };
  }
};
</script>

In this example, we use the teleport component to render the modal dialog outside the current DOM hierarchy, allowing for greater flexibility in managing the position and behavior of dynamic UI elements.

3. Fragments:
Vue 3 introduces support for Fragments, which enable components to return multiple root nodes without the need for an extra wrapping element. Here's an example of using Fragments to render a list of items in a Vue 3 component:

<template>
  <>
    <h2>Item List</h2>
    <ul>
      <li v-for="item in items" :key="item.id">
        {{ item.name }}
      </li>
    </ul>
  </>
</template>

<script>
import { ref } from 'vue';

export default {
  setup() {
    const items = ref([
      { id: 1, name: 'Item 1' },
      { id: 2, name: 'Item 2' },
      { id: 3, name: 'Item 3' }
    ]);

    return {
      items
    };
  }
};
</script>

In this example, we use Fragments to return multiple root nodes from the component without needing to wrap them in a parent element, resulting in cleaner and more concise template code.

4. Better TypeScript Support:
Vue 3 offers enhanced support for TypeScript, providing better type inference and more robust type checking capabilities. Here's a simple example demonstrating improved TypeScript support in Vue 3 component:

interface User {
  id: number;
  name: string;
  age: number;
}

export default defineComponent({
  data(): {
    return {
      user: {
        id: 1,
        name: 'John Doe',
        age: 30
      } as User
    };
  }
});

In this TypeScript example, we define an interface for the User type and use it to provide type annotations for the user data property, leveraging Vue 3's improved TypeScript integration.

5. Smaller Bundle Size and Better Performance:
Vue 3 has been optimized for improved performance and reduced bundle size, thanks to its re-written virtual DOM implementation. While the benefits of performance optimizations may not be directly demonstrated in a code example, developers can expect faster rendering and better overall application performance in Vue 3.

In conclusion, Vue 3 introduces a host of compelling new features and improvements that enhance its capabilities for building modern web applications. From the Composition API to Teleport, Fragments, improved TypeScript support, and performance optimizations, Vue 3 offers a powerful set of tools and capabilities for developers. The examples provided here illustrate the practical usage of these features, showcasing their utility and flexibility in real-world Vue 3 applications.

Cloning Reactive Objects in JavaScript

Akshaya Mallyar Shet — Tue, 16 Jul 2024 11:44:56 +0000

Cloning an object in JavaScript is a common operation, but when it comes to cloning reactive objects, there are some additional considerations to keep in mind, especially when working with frameworks such as Vue.js or React. In this article, we'll explore how to properly clone reactive objects and provide examples using Vue.js.

Shallow Cloning vs. Deep Cloning
When it comes to cloning objects, it's important to understand the difference between shallow cloning and deep cloning. Shallow cloning creates a new object with the same top-level properties as the original object, but the nested objects within the original object are still referenced in the new object. Deep cloning, on the other hand, creates a completely new object with all nested objects also cloned.

Cloning Reactive Objects in Vue.js
In Vue.js, objects that are part of the component's data are made reactive using the Vue reactivity system. When cloning reactive objects in Vue.js, it's important to ensure that the reactivity is preserved in the cloned object. Vue provides the Vue.util object, which contains several utility methods for working with reactive objects. One of these methods is Vue.util.defineReactive, which can be used to define a reactive property on an object.

Example: Cloning a Reactive Object in Vue.js

// Original reactive object
const originalObject = Vue.observable({
  name: 'John',
  age: 30,
});

// Cloning the reactive object
const clonedObject = {};
for (let key in originalObject) {
  Vue.util.defineReactive(clonedObject, key, originalObject[key]);
}

In this example, we first create the original reactive object using Vue.observable. Then, we clone the object by iterating over its properties and using Vue.util.defineReactive to define each property on the new object.

It's important to note that this method only performs a shallow clone, meaning that any nested objects within the original object will still be referenced in the cloned object. If deep cloning is required, an additional deep cloning utility, such as Lodash's _.cloneDeep, can be used to ensure that all nested objects are also cloned.

In conclusion, when working with reactive objects in frameworks like Vue.js, it's crucial to handle object cloning with care to preserve reactivity and avoid unintended side effects. By using the appropriate methods and utilities, such as those provided by Vue.js itself or third-party libraries, developers can safely clone reactive objects while maintaining reactivity and data integrity.

Unlocking the Power of CSS Grid for Modern Web Design

Akshaya Mallyar Shet — Tue, 16 Jul 2024 09:59:45 +0000

CSS Grid is revolutionizing the way web developers create layouts, offering a flexible and efficient approach to designing responsive web pages. With its powerful features and intuitive syntax, CSS Grid is becoming an essential tool for building modern, dynamic websites.

Understanding the Basics of CSS Grid

At its core, CSS Grid enables developers to create two-dimensional grid-based layouts with rows and columns, providing precise control over the placement and alignment of elements on a web page. By defining the grid container and its items, developers can easily achieve complex designs without relying on overly nested HTML structures or complicated positioning techniques.

Let's take a look at a simple example to understand the basic usage of CSS Grid. Consider the following code snippet:

<div class="grid-container">
  <div class="grid-item">1</div>
  <div class="grid-item">2</div>
  <div class="grid-item">3</div>
  <div class="grid-item">4</div>
  <div class="grid-item">5</div>
  <div class="grid-item">6</div>
</div>

.grid-container {
  display: grid;
  grid-template-columns: 100px 100px 100px;
  grid-gap: 10px;
}

.grid-item {
  background-color: #f2f2f2;
  padding: 20px;
  text-align: center;
}

In this example, we have defined a simple grid container with three columns, each 100 pixels wide, and a 10-pixel gap between the grid items. The grid items are automatically placed within the grid, creating a neatly organized layout.

Creating Responsive Layouts with CSS Grid

One of the standout features of CSS Grid is its ability to handle responsive designs with ease. By using media queries and flexible units, developers can adjust the grid layout based on different screen sizes and devices, delivering a seamless user experience across various platforms.

For instance, we can modify the previous example to create a responsive grid layout that adapts to different screen widths. By using the fr unit, we can distribute the available space evenly among the columns, ensuring a fluid and adaptable layout.

.grid-container {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  grid-gap: 10px;
}

Conclusion

CSS Grid represents a significant advancement in web layout design, offering a modern and efficient approach to building visually stunning and responsive websites. With its ability to create intricate two-dimensional layouts, handle responsive designs, and simplify the development process, CSS Grid has solidified its place as a fundamental technology for modern web design.

Incorporating CSS Grid into your web development toolkit can unlock a world of possibilities, allowing you to unleash your creativity and build captivating web experiences. As the web continues to evolve, CSS Grid remains a critical tool for crafting dynamic and engaging layouts that resonate with today's audiences.

Forem: Akshaya Mallyar Shet

Comparing Vue's Composition API and Options API

Options API

Composition API

Differences and Use Cases

Conclusion

Understanding the Differences Between Vue 2 and Vue 3

1. Composition API vs. Options API

Vue 2: Options API

Vue 3: Composition API

Key Takeaway

2. Performance Improvements

Example

3. TypeScript Support

Vue 2: Limited TypeScript Support

Vue 3: First-Class TypeScript Support

Key Takeaway

4. Reactivity System

Vue 2: Object-based Reactivity

Vue 3: Proxy-based Reactivity

Key Takeaway

5. Fragments

Vue 2: Single Root Node

Vue 3: Support for Multiple Root Nodes

Key Takeaway

Conclusion

25 JavaScript Concept Interview Questions with Examples

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

2. What is hoisting?

3. Explain closures.

4. What are promises?

5. What is async/await?

6. What are arrow functions?

7. Explain the this keyword.

8. What is the event loop?

9. What is the difference between == and ===?

10. What is the purpose of the bind method?

11. Explain prototypal inheritance.

12. What are modules in JavaScript?

13. What is the spread operator?

14. What is destructuring?

15. What is a higher-order function?

16. What is the difference between synchronous and asynchronous programming?

17. What is a callback function?

18. What is the instanceof operator?

19. What is the purpose of setTimeout and setInterval?

20. What are JavaScript data types?

21. What is a template literal?

22. What is a wrapper object?

23. Explain the difference between slice and splice.

24. What is the difference between synchronous and asynchronous functions?

25. What is JSON?

Conclusion

Minting JWT Token Using Node.js

Minting JWT Token Using Node.js

Introducing Vue 3: Exploring Its New Features with Examples

Cloning Reactive Objects in JavaScript

Unlocking the Power of CSS Grid for Modern Web Design

Understanding the Basics of CSS Grid

Creating Responsive Layouts with CSS Grid

Conclusion

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

7. Explain the `this` keyword.

9. What is the difference between `==` and `===`?

10. What is the purpose of the `bind` method?

18. What is the `instanceof` operator?

19. What is the purpose of `setTimeout` and `setInterval`?

23. Explain the difference between `slice` and `splice`.