Programing Assignment Sample

Sample 1

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The Document Object Model (DOM) is a programming interface that allows JavaScript to interact with and manipulate the structure, content, and styles of an HTML document. Representing the document as a tree structure, each element becomes a node that can be accessed and modified. For instance, using document.getElementById("myDiv").innerHTML = "Hello!"; changes the content of an HTML element with the ID myDiv. The DOM is essential for dynamic web development, enabling developers to create interactive, responsive web pages by updating elements in real time without reloading the page.

Sample 2

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Answer :

var is function-scoped and allows variable re-declaration, which can lead to unexpected behavior. let is block-scoped, preventing re-declaration within the same scope and making it safer for modern development. For instance:

let x = 10;
x = 20; // Allowed

const is also block-scoped but is used for variables that cannot be reassigned after initialization. For example:

const PI = 3.14;
PI = 3.15; // Error
Choosing the correct declaration ensures cleaner and more predictable code, especially in large-scale projects.

Sample 3

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Answer :

JavaScript handles asynchronous operations using callbacks, promises, and async/await syntax. Callbacks are functions passed as arguments to other functions to execute after a task completes, but they can lead to "callback hell." Promises simplify asynchronous workflows by providing .then() and .catch() methods for handling success or failure. For instance:

fetch("https://api.example.com")
.then(response => response.json())
.then(data => console.log(data))
.catch(error => console.error(error));
The async/await syntax further streamlines asynchronous code, making it more readable and easier to debug.

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Assignment sample solution of WDD2301 - Web Development with JavaScript

Programing Assignment Sample

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