JavaScript Fundamentals

What keyword is used to declare a variable in JavaScript?

• var

• const

• let

• function

What are the primitive data types in JavaScript?

• string, number, boolean, null, undefined, symbol

• integer

• array

• object

What is the operator used for assigning a value to a variable in JavaScript?

• =

• +

• *

• /

How do you define a function in JavaScript?

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

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

• function functionName(parameters) { // implementation }

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

What keyword is used for creating conditional statements in JavaScript?

• if

• switch

• else

• for

Which loop is used when you want to execute a block of code a specific number of times in JavaScript?

• for

• switch

• while

• if

What are the different data structures available in JavaScript?

• trees

• graphs

• arrays, objects, sets, maps, stacks, queues, linked lists

• heaps

What is the importance of code design in JavaScript?

• Code design in JavaScript only matters for small projects

• Code design in JavaScript leads to more bugs and errors

• Code design in JavaScript is crucial for organizing code, improving readability, enhancing maintainability, and reducing bugs.

• Code design in JavaScript is irrelevant and unnecessary

What is the purpose of the 'let' keyword in JavaScript?

• To define global variables

• To import external libraries

• To create functions

• To declare block-scoped variables

What is the result of 10 + '5' in JavaScript?

• 15

• 50

• 105

• 55