24/01/2024

What is JavaScript primarily used for?

• Database Management

• Creating Dynamic Web Pages

• Network Security

• Graphic Designing

Which keyword is used to declare a constant variable in JavaScript?

• let

• const

• var

• constant

What is the purpose of the document.getElementById() function?

• To get the value of an input field

• To select an HTML element by its id

• To create a new HTML element

• To delete an HTML element

What is the purpose of the addEventListener method in JavaScript?

• To change the style of an element

• To create a new HTML element

• To add an event handler to an element

• To remove an element from the DOM

How do you declare a function expression in JavaScript?

• function myFunction() {}

• const myFunction = function() {}

• let myFunction = () => {}

• both b and c

What does the typeof operator return for an array

• array
  

• object

• list

• typeof doesn't work for arrays

In JavaScript, which loop is ideal for iterating over the elements of an array?

• while
  

• Do-while

• for-in

• for

Which keyword is used to exit a loop prematurely in JavaScript?

• break

• exit

• return

• end

What does the NaN value represent in JavaScript?

• Not a Number

• Negative And Null

• Null or Negative

• Not Any Number

How do you check if a variable is of type "string" in JavaScript?

• typeof variable === 'string'

• variable.type === 'string'

• typeOf(variable) == 'string'

• variable instanceof String