JavaScript Loops Worksheet

Questions

Question 1

What is the difference between a while loop and a for loop?

While loops use boolean expressions while for loops uses counter variables which allows you to execute a code block a specific number of times.

Question 2

What is an iteration?

The code inside the loop that loops over and over again.

Question 3

What is the meaning of the current element in a loop?

A current element is whats proccessed within the body of the loop.

Question 4

What is a 'counter variable'?

A counter variable is used to determine how many times the loop iterates.

Question 5

What does the break; statement do when used inside a loop?

It stops the loop.

Question 6

Explain what the following code is doing (if you would like to run this code, you can paste it into the SCRIPT element in the page):


		const allH4elements = document.getElementsByTagName("h4");
		for(let x = 0; x < allH4elements.length; x++){
			console.log(allH4elements[x].innerHTML);
		}

It is checking for how many H4 elements there are.

Coding Problems

Coding Problems - See the 'script' tag below this h3 tag. You will have to write some JavaScript code in it.

Always test your work! Check the console log to make sure there are no errors.