Let us start by solving the exercise described
below with what you have learned till now.
Try not to scroll down or take a peek at the solution.
exercise:
As we get ready for our annual Felicitation ceremony,
we have a list of guests stored as objects,
each with a property called role.
This role can have different values like
faculty, volunteer, student, and visitor.
Only those labeled as faculty or volunteer
are allowed to go backstage.
Your task is to write code that checks the role
of each guest and logs Access granted
to the console, if they are faculty or volunteer.
Otherwise, it should log Access denied to the console.
There is a possibility that some of us would have
solved the above problem in the below given manner:
In the above snippet, we have two if conditions that
logs the same output to the screen. We can improve
this using the OR || operator.
Look at the code snippet below which
is taken from the solution that we have provided:
As you can see we have written the same code in much
simpler terms by combining both if conditions
using the || operator in a single if statement.
We can use the OR operator - ||,
to confirm if at least one condition is
true before executing a block of code.
In the solution to the example
given above, the if statement
has two conditions -
guest.role === "faculty"
and guest.role === "volunteer",
both giving the same output logging
to the console.
This means that the code block of the
if statement will be executed if at least
one of the conditions are true.
If both of them are false the else
code block will get executed.
This behavior can be represented in a table
as shown below.
| guest.role === "faculty" | guest.role === "volunteer" | Result |
|---|
| true | true | true |
| true | false | true |
| false | true | true |
| false | false | false |