I wasn't sure where to ask this so I will here: What does the "?" and ":" mean ive seen then but dont kno what it means so can someone help me?

The ternary operators `?` - `:` are short cut for `if` - `then` - `else` involving expressions. For example to set `m` to the maximum value of `a` and `b` I could write ``` if (a > b) { m = a; } else { m = b; } ``` But those five lines of code are so tedious for such a simple assignment. So instead I take a short cut and write ``` m = (a > b) ? a : b; ```

in project hoppy beaver Extreme it says that i can add NPCs but i can't figure out how to make them attack Hoppy. is they a article or something on that?

No, there is no article on that. You can just make them follow Hopper, and then make an animation of something that attacks Hopper. Hope this helps!

How would I add a losing screen? ```else if (beaver.sticks/sticks.length <=0.95){ text("Take the L",100,200); }``` This doesn't work because it always pops up until the player wins. Would there be a way to only check this statement once all of the sticks have moved off the canvas?

You could add another condition with the `&&` operator that will only be true if the sticks have moved past. It could check if all the sticks have past you on the screen using their X value. You could make less hard coded numbers for flexibility with the amount of sticks.

is it ok that i can't come up with the code for different things on my own in project hoppy beaver and have to get help from the starter code? i based my "NPCs"(rocks) on sticks code etc. Asking coz in introJS i didnt have this problem except for a few things then could work things out with a hint. do i need to read up on some sort of documentation?

It is OK to ask questions and get help.

Is there any function that can stop a program? (As in when Game Over occurs?)

Invoke `noLoop();` is you no longer need the services of `draw`.

Why does it say "keyCode === 0" I thought the keycode for space bar is 32? I tried 32, and it didn't work.

It's a bug in the code. You cannot depend on `keyCode` inside of the `draw` function. Try `key.toString() === ' '` instead.

Main content

Computer programming - JavaScript and the web

Course: Computer programming - JavaScript and the web > Unit 4

Lesson 4: Making a side scroller: Hoppy Beaver

Scoring and winning

Q: How would I add a losing screen? ```else if (beaver.sticks/sticks.length <=0.95){ text("Take the L",100,200); }``` This doesn't work because it always pops up until the player wins. Would there be a way to only check this statement once all of the sticks have moved off the canvas?

You could add another condition with the `&&` operator that will only be true if the sticks have moved past. It could check if all the sticks have past you on the screen using their X value. You could make less hard coded numbers for flexibility with the amount of sticks.

Q: is it ok that i can't come up with the code for different things on my own in project hoppy beaver and have to get help from the starter code? i based my "NPCs"(rocks) on sticks code etc. Asking coz in introJS i didnt have this problem except for a few things then could work things out with a hint. do i need to read up on some sort of documentation?

It is OK to ask questions and get help.

Q: Is there any function that can stop a program? (As in when Game Over occurs?)

Invoke `noLoop();` is you no longer need the services of `draw`.

Q: Why does it say "keyCode === 0" I thought the keycode for space bar is 32? I tried 32, and it didn't work.

It's a bug in the code. You cannot depend on `keyCode` inside of the `draw` function. Try `key.toString() === ' '` instead.

Google Classroom

Okay, but what's a game if there's no winning or losing? It's LIFE! Haha, but no, really. Let's add a score and a win state to the game. We have many options for how we could score:

Count how many sticks the beaver grabs.
Count how many sticks the beaver misses.
Award more points for higher accuracy - like based on distance of beaver from stick center.

Sometimes games are purely about scores and raising your score, but other times, they have distinct win or lose states. What could we do in this game?

Declare them a winner if they grabbed some percentage of the sticks (up to 100%).
Immediately fail them if they miss some percentage of the sticks.
Fail them if they miss some number of sticks in a row.

For simplicity's sake, let's implement the first options: we'll score based on the number of stick grabs, and we'll declare them a winner if they get 95% of the sticks.

We want to always display the score, so we can just stick a text command in the draw function:

text("Score: " + beaver.sticks, 20, 20);

For the win state, we should come up with a condition that we can check each time, and then do something festive if it's true. Here's what we could do if we wanted to make sure you got 95% of the sticks:

if (beaver.sticks/sticks.length >= 0.95) {
    text("YOU WIN!!!!", width/2, height/2);
}

Give it a go! Can you win?

Want to join the conversation?

Sort by:

Haven_Remix
Posted 7 years ago. Direct link to Haven_Remix's post “I wasn't sure where to as...”
I wasn't sure where to ask this so I will here:
What does the "?" and ":" mean ive seen then but dont kno what it means
so can someone help me?
Button navigates to signup pageComment on Haven_Remix's post “I wasn't sure where to as...”
(20 votes)
Answer
- Bob Lyon
  Posted 7 years ago. Direct link to Bob Lyon's post “The ternary operators `?`...”
  The ternary operators ? - : are short cut for if - then - else involving expressions. For example to set m to the maximum value of a and b I could write
  if (a > b) { m = a; } else { m = b; }
  But those five lines of code are so tedious for such a simple assignment. So instead I take a short cut and write
  m = (a > b) ? a : b;
  Comment on Bob Lyon's post “The ternary operators `?`...”
  (58 votes)
ShockWαve™
Posted 9 years ago. Direct link to ShockWαve™'s post “in project hoppy beaver E...”
in project hoppy beaver Extreme it says that i can add NPCs but i can't figure out how to make them attack Hoppy. is they a article or something on that?
Button navigates to signup pageComment on ShockWαve™'s post “in project hoppy beaver E...”
(20 votes)
Answer
- T̷h̷e̷C̷o̷d̷i̷n̷g̷L̷e̷g̷e̷n̷d̷ INACTIVE
  Posted 3 years ago. Direct link to T̷h̷e̷C̷o̷d̷i̷n̷g̷L̷e̷g̷e̷n̷d̷ INACTIVE's post “No, there is no article o...”
  No, there is no article on that. You can just make them follow Hopper, and then make an animation of something that attacks Hopper. Hope this helps!
  Comment on T̷h̷e̷C̷o̷d̷i̷n̷g̷L̷e̷g̷e̷n̷d̷ INACTIVE's post “No, there is no article o...”
  (4 votes)
Zoe
Posted 8 years ago. Direct link to Zoe's post “For the Hoppy Beaver Extr...”
For the Hoppy Beaver Extreme project I cannot seem to find a way to display the winning/losing screen once the whole game has run (regardless if you meet the win conditions before the end). Is there a way to set the program to move onto the next scene/display an end screen after a specified period of time or after x amount of sticks have been removed from the screen?
Button navigates to signup pageButton navigates to signup page
(11 votes)
Answer
Looch
Posted 5 years ago. Direct link to Looch's post “How would I add a losing ...”
How would I add a losing screen?
else if (beaver.sticks/sticks.length <=0.95){ text("Take the L",100,200); }

This doesn't work because it always pops up until the player wins. Would there be a way to only check this statement once all of the sticks have moved off the canvas?
Button navigates to signup pageComment on Looch's post “How would I add a losing ...”
(9 votes)
Answer
- LaserGun456
  Posted 3 years ago. Direct link to LaserGun456's post “You could add another con...”
  You could add another condition with the && operator that will only be true if the sticks have moved past. It could check if all the sticks have past you on the screen using their X value. You could make less hard coded numbers for flexibility with the amount of sticks.
  Comment on LaserGun456's post “You could add another con...”
  (4 votes)
natashaonline1111
Posted 6 months ago. Direct link to natashaonline1111's post “is it ok that i can't com...”
is it ok that i can't come up with the code for different things on my own in project hoppy beaver and have to get help from the starter code? i based my "NPCs"(rocks) on sticks code etc. Asking coz in introJS i didnt have this problem except for a few things then could work things out with a hint. do i need to read up on some sort of documentation?
Button navigates to signup pageButton navigates to signup page
(6 votes)
Answer
- AD Baker
  Posted 6 months ago. Direct link to AD Baker's post “It is OK to ask questions...”
  It is OK to ask questions and get help.
  Comment on AD Baker's post “It is OK to ask questions...”
  (6 votes)
Mia Herrera
Posted 4 years ago. Direct link to Mia Herrera's post “How would you subtract fr...”
How would you subtract from the score, say if the beaver touched an enemy, he would lose a point?
Button navigates to signup pageComment on Mia Herrera's post “How would you subtract fr...”
(9 votes)
Answer
Michael Blair
Posted 4 years ago. Direct link to Michael Blair's post “Can someone help me with ...”
Can someone help me with the code for Hoppy Beaver Extreme?
Button navigates to signup pageButton navigates to signup page
(8 votes)
Answer
Emily Cheng
Posted 6 years ago. Direct link to Emily Cheng's post “Is there any function tha...”
Is there any function that can stop a program? (As in when Game Over occurs?)
Button navigates to signup pageButton navigates to signup page
(4 votes)
Answer
- Bob Lyon
  Posted 6 years ago. Direct link to Bob Lyon's post “Invoke `noLoop();` is you...”
  Invoke noLoop(); is you no longer need the services of draw.
  Comment on Bob Lyon's post “Invoke `noLoop();` is you...”
  (9 votes)
Zaynebalbedaiwi
Posted 4 years ago. Direct link to Zaynebalbedaiwi's post “Why does it say "keyCode ...”
Why does it say "keyCode === 0" I thought the keycode for space bar is 32? I tried 32, and it didn't work.
Button navigates to signup pageButton navigates to signup page
(4 votes)
Answer
- Bob Lyon
  Posted 4 years ago. Direct link to Bob Lyon's post “It's a bug in the code. Y...”
  It's a bug in the code. You cannot depend on keyCode inside of the draw function. Try key.toString() === ' ' instead.
  Comment on Bob Lyon's post “It's a bug in the code. Y...”
  (6 votes)
Xander
Posted 8 months ago. Direct link to Xander's post “Is there a way to do this...”
Is there a way to do this on the iPad?
Button navigates to signup pageButton navigates to signup page
(4 votes)
Answer
- -B-k-
  Posted 4 months ago. Direct link to -B-k-'s post “Yes, you should be able t...”
  Yes, you should be able to do this on your iPad!
  Comment on -B-k-'s post “Yes, you should be able t...”
  (1 vote)