UX Design and Development course

Comparators

Lets now focus on the conditional part:

if (country === "France") {
    ...
}

The conditional part is the variable country followed by the three equal signs (===). Three equal signs tests if the variable country has both the correct value (France) and also the correct type (String). You can test conditions with double equal signs, too, however a conditional such as if (x == 5) would then return true for both var x = 5; and var x = "5";. Depending on what your program is doing, this could make quite a difference. It is highly recommended as a best practice that you always compare equality with three equal signs (=== and !==) instead of two (== and !=).

Other conditional test:

  • x > a: is x bigger than a?
  • x < a: is x less than a?
  • x <= a: is x less than or equal to a?
  • x != a: is x not a?
  • x: does x exist?

Exercise

Correct!
False!

Add a condition to change the value of a to the number 10 if x is bigger than 5.

var x = 6; var a = 0;