Theory
Theory
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Let’s combine logical operators

Now that you have learned how to use negations, we can describe a new logic of the program that will work without errors.

We need to combine two separate checks into one single check. The project can be started if:

there are enough developers
and they have the knowledge of the technologies
and no developers are on vacation
and no developers are out sick.

Implementing this logic in the code is quite easy, because negations can be combined with other logical operators. Example:

var conditionOne = true;
var conditionTwo = true;
var conditionThree = false;

if (conditionOne && conditionTwo && !conditionThree) {
  // code will be executed
}

It’s time to complete the third program of this work day!

script.js

JavaScript

var enoughDevelopers = false; var techAvailable = false; var onVacation = false; var onSickLeave = false; if (enoughDevelopers && techAvailable) { console.log('You can start the project'); }

Goalscompleted

Let’s complete the program and check its behavior.

Add !onVacation condition at the end of the check using “logical AND”.
And after it, also using “logical AND” !onSickLeave condition.
Now add the else fork and log the 'You cannot start the project' message in it.
Correct the values of the variables so that the condition is fulfilled.
Then indicate that someone from the developers is on vacation and make sure that the project cannot be started.

Let’s combine logical operators

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Result

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