&&, || and !
JavaScript · Unit 2: Conditionals
- Full plan
- JavaScript
- 10 exercises
&& joins two conditions and gives true only if both are met. If one fails, the whole thing is false.
It is written with two & signs.
console.log(5 > 3 && 4 > 1);
console.log(5 > 3 && 2 > 4);Prints
true false
The rest of the explanation is in the lesson, which is part of the full plan.
Exercises in this lesson
You do them in the app, which checks them on the spot and explains why.
1. Predict the output
What does this code print?
2. Complete the code
You pass with 60 or more and fewer than 3 absences. Fill in the condition.
3. Predict the output
What does this code print?
4. Find the bug
It should say there is stock only for sizes S and M. This one is an L. Which line has the error?
5. Predict the output
What does this code print?
6. Complete the code
Fill in the blank so it says whether there is room on the bus.
7. Multiple choice
Kids under 5 and adults over 65 get in free. Which condition goes in the
if?8. Predict the output
The top score is 100, and this one is 101. What does it print?
9. Put the lines in order
The person types 101. Put the lines in order to accept only scores from 0 to 100.
10. Predict the output
What does this code print?
It opens in your browser. This lesson is part of the full plan; the first unit of each course is free.