JavaScript Exercise Quiz

What is the correct syntax for referring to an external script called "app.js"?

• <script href="app.js">

• <script src="app.js">

• <script ref="app.js">

• <script link="app.js">

How do you write "Hello World" in an alert box?

• alertBox("Hello World");

• msg("Hello World");

• alert("Hello World");

• message("Hello World");

Which operator is used to assign a value to a variable?

• =

• ==

• ===

• :=

What will typeof null return?

• "null"

• "object"

• "undefined"

• "string"

How do you create a function in JavaScript?

• function myFunction() {}

• def myFunction() {}

• function:myFunction() {}

• myFunction() = function {}

Which method is used to add an element to the end of an array?

• push()

• pop()

• shift()

• unshift()

How do you declare a variable in JavaScript?

• var x;

• variable x;

• v x;

• let = x;

What is the output of console.log(2 + "2");?

• 4

• "22"

• 22

• "4"

Which event occurs when the user clicks on an HTML element?

• onchange

• onclick

• onmouseclick

• onhover

How do you write a comment in JavaScript?

• // This is a comment

• # This is a comment

• /* This is a comment */