Code.org Discoveries

What is the difference between sprite.visible being false and using sprite.destroy ( )?

• nothing, they're both the same

• sprite.destroy( ) requires that you re-create the sprite

• sprite.visible = false will require that you re-create the sprite

• because you can no longer see the sprite, then it no longer exists

When calling sprite.IsTouching(target) and you increase the score, why does the score go up so high?

• Because the draw() function is a loop and the two sprites are touching many times.

• What? no my score only goes up once. The sprites only touch once.

• The IDE knows that I don't want to increase the score just by one and gives me a larger number because it thinks it's better to use larger numbers.

• Because the sprite don't actually touch once I set sprite.visible = false.

What's the difference between var sprite, and var x?

• With a sprite you will need to call CreateSprite()

• With a sprite you will need to call SetAnimation( )

• the variable x is only used to hold a value that can be changed.

• all of the above.

the if(keyDown(up)) returns

• a boolean value of true if the user presses the down key

• a boolean value of false if the user presses the down key

• A boolean value of true if the user presses the up key

• A boolean value of false if the user presses the up key

Give an example of a nested if-condition

• if(keyDown(up) and keyDown(left)) then sprite.y = sprite.y + 5;

• if (keyDown(up)) then sprite.y = sprite.y + 5;

• if (keyDown(up) or keyDown(left)) then sprite.y = sprite.y + 5;

• if (keyDown(up)) then if(sprite.y > 400) then sprite.y = 0;

In the draw loop, if you call the text function before the drawSprites and/or background function, what happens?

• You won't be able to see your text because the sprites and background will be drawn on top of the text.

• You will be able to see your text because Game Lab knows you want to see the text.

• You won't be able to see your sprites or background because order doesn't matter.

• You will be able to see your text because the sprites and the background will be drawn after the text.

What happens if you don't call background in your draw loop and your sprite has movement?

• nothing, animation is fine.

• the sprites are drawn on top of each other to simulate movement, the older drawings don't get erased.

• you don't need to call background because you don't have one.

• you can just use sprite.move( ) so there's no need for the function background( )

What happens in this code?

• nothing is shown, there are no sprites

• the background is white and we can't see anything because the textsize is 0;

• the background is white, the counter increases in size as the counter increase.

• the background is white, and we see a number that goes up but the textsize stays the same.

Predict what will show up on console.log

• true true true

• true false false

• false false false

• true false true

What code do we add to make the elephant push the hippo off the screen?

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