JavaScript Fundamentals

Which of the following is not a valid primitive data type in JavaScript?

• Number

• String

• Object

• Boolean

What is the correct way to declare an empty array in JavaScript?

• var myArray = {};

• var myArray = [];

• var myArray = new Array();

• Both b and c are correct

What is the output of the following code?

function greet(name) {

console.log("Hello, " + name + "!");

}

greet("Alice");

• Hello, Alice!

• function greet(name) {...}

• undefined

• Error

Which method is used to access a specific element in an array by its index?

• getElementsByIndex

• getElementAt

• charAt ✅

• None of the above

How would you retrieve a reference to an HTML element with the ID "myElement" using JavaScript?

• document.getElementByID("myElement");

• document.getElementById("myElement");

• document.querySelectorAll("#myElement");

• document.getElementsByClassName("myElement");

What is the difference between .innerHTML and .innerText?

• .innerHTML includes HTML tags, while .innerText does not

• .innerText includes HTML tags, while .innerHTML does not

• There is no difference between them

• .innerHTML is used for setting content, while .innerText is used for getting content

Which method is used to get the value of an attribute of an HTML element?

• getAttribute()

• getElementAttribute()

• getAttributeValue()

• None of the above

Which method is used to change the value of an attribute of an HTML element?

• setAttribute()

• setElementAttribute()

• setAttributeValue()

• None of the above

What is the difference between .textContent and .innerText?

• There is no difference between them

• .innerText only includes visible text, while .textContent includes text within hidden elements

• .textContent is used for setting text, while .innerText is used for getting text

• .textContent only includes visible text, while .innerText includes text within hidden elements

How would you change the text content of an HTML element with the ID "myParagraph"?

(Two Correct Answers)

• document.getElementById("myParagraph").text = "New text";

• document.getElementById("myParagraph").textContent = "New text";

• document.getElementById("myParagraph").innerText = "New text";

• document.querySelector("#myParagraph").text = "New text";