HTML, CSS & JavaScript – Lesson 3 Review KS3

What is the purpose of an IF statement in JavaScript?

Which of the following is a correct JavaScript IF statement?

How does JavaScript retrieve user input from an input field?

What will happen if a user enters an age of 20 in the bartender program? Below is a reminder of the main function involved.

function barman() {
  			var age = document.getElementById("age").value
  			if (age >= 18) {
  				alert("What can I get you?")
  				}
  			else {
  				alert("Not old enough to be served - Go Home!")
  				}
  		}

What happens in an IF-ELSE statement when the IF condition is false?

What operator is used to check if a value is greater than or equal to another value?

How can we ensure user input is treated as a number in JavaScript?

What would happen if a user enters text instead of a number in the bartender program? Below is a reminder of the main function involved.

function barman() {
  			var age = document.getElementById("age").value
  			if (age >= 18) {
  				alert("What can I get you?")
  				}
  			else {
  				alert("Not old enough to be served - Go Home!")
  				}
  		}

Which statement correctly checks if a user’s input is exactly equal to 18?

Why are IF statements important in programming?