Complete Java script

What are the different data types in JavaScript?

• array

• integer

• float

• string, number, boolean, object, function, undefined, null

Explain the difference between let, var, and const in JavaScript.

• let is block-scoped, var is block-scoped, and const is block-scoped but can be reassigned.

• let is block-scoped, var is block-scoped, and const is function-scoped.

• let is block-scoped, var is function-scoped, and const is block-scoped but cannot be reassigned.

• let is function-scoped, var is block-scoped, and const is block-scoped but can be reassigned.

How do you declare a function in JavaScript?

• def functionName(parameters): # code here

• function functionName(parameters) { // function body }

• void functionName(parameters) { // code here }

• functionName(parameters) { // code here }

What is the purpose of conditional statements in JavaScript?

• Conditional statements in JavaScript are used for mathematical calculations

• Conditional statements in JavaScript are used for playing audio files

• Conditional statements in JavaScript are used to make decisions in the code based on certain conditions.

• Conditional statements in JavaScript are used for styling web pages

What is the syntax for a 'for' loop in JavaScript?

• for(initialization; condition; iteration) { // code block to be executed }

• for(initialization; condition) { // code block to be executed }

• for(condition; iteration) { // code block to be executed }

• for(initialization; iteration) { // code block to be executed }

How do you create an array in JavaScript?

• array myArray = [1, 2, 3, 'hello'];

• myArray = [1, 2, 3, 'hello'];

• const myArray = [1, 2, 3, 'hello'];

• let myArray = [1, 2, 3, 'hello'];

Explain the concept of objects in JavaScript.

• Objects in JavaScript are used to store collections of data and more complex entities. They consist of key-value pairs where keys are strings (or Symbols) and values can be any data type.

• Objects in JavaScript cannot contain key-value pairs.

• Objects in JavaScript are not a fundamental concept in programming.

• Objects in JavaScript are used to store single values only.

What is DOM manipulation and why is it important in web development?

• DOM manipulation is only used for styling web pages.

• DOM manipulation is essential for creating interactive and responsive web applications.

• DOM manipulation is not necessary in web development.

• DOM manipulation is primarily used for server-side scripting.

What is the Browser Object Model (BOM) in JavaScript?

• A type of browser extension

• A set of APIs that allow JavaScript to interact with the browser.

• A tool for debugging JavaScript code

• A programming language used to style web pages

What are some advanced JavaScript concepts that you should be familiar with?

• Closures, prototypes, async/await, promises, higher-order functions, ES6 features

• Event delegation, event bubbling, event capturing

• Classes, inheritance, try/catch blocks

• DOM manipulation, event listeners, AJAX