Web L4 (Advanced)

In this line, what is the purpose of addEventListener?

btn.addEventListener("click", function(){ ... })

• To create a new element

• To style the button

• To run the function when the page loads

• To execute a function when the button is clicked

What will be printed by the following code?

let name = "Maryam";

name = "Menna";

console.log(name)

• Maryam

• Menna

• Error

• Undefined

What happens if you try to reassign pi in this code?

const pi = 3.14;

pi = 3.14159;

• pi will change to 3.14159

• It will log both values

• It will throw an error

• Nothing happens

Which of the following is the correct way to access the type property of the laptop object?

let laptop = {

type:hp,

ram:16,

price:40000

}

• laptop[type]

• laptop.type

• laptop->type

• laptop::type

Which syntax is used to change the text color of an element with id="title" in JavaScript?

• document.getElementById("title").color = "red";

• document.getElementById("title").style.textColor = "red";

• document.getElementById("title").style.color = "red";

• document.style("title").color = "red";

What is the correct keyword to define a function in JavaScript?

• function

• func

• def

• local

Which of the following developer tools shows the code for the web page ?

• console

• Elements/inspector

• network

• sources

What tool helps you view the output of JavaScript in the browser?

• console

• sources

• network

• Inspector

Which of the following data types is a key value pair?

• string

• array

• objects

• number

What happens when the button with id "btn" is clicked?

btn.addEventListener("click", function(){

btn.style.backgroundColor = "blue"

btn.style.color = "white"

let user = prompt("What is your name?");

alert("Welcome " + user);

result.innerHTML = "Welcome " + user;

})

• It changes the button text.

• It changes the color and backgroundcolor of the result element.

• It asks the user for their name and displays a welcome message then change the style of the button.

• It changes the color and backgroundcolor of the button only.