JS Variable Review

What is the name of the variable?

• ball

• draw

• ellipse

• function

Answer explanation

The variable name is 'ball', which is one of the answer choices provided. The other options, 'draw', 'ellipse', and 'function', do not represent the variable in question.

What is the purpose of the variable in this code?

• To store the X-POSITION of the ellipse

• To store the Y-POSITION of the ellipse

• To store the WIDTH of the ellipse

• To store the HEIGHT of the ellipse

Answer explanation

The variable is used to store the X-POSITION of the ellipse, which determines its horizontal placement on the canvas. This is crucial for rendering the ellipse at the correct location.

How many times do you need DECLARE a variable?

• Once

• Depends

Answer explanation

You only need to DECLARE a variable once in a given scope. After declaration, you can use the variable multiple times without needing to declare it again.

What is animating in this code?

• the ellipse is moving RIGHT

• the ellipse is moving DOWN

• the ellipse is getting WIDER

• the ellipse is getting TALLER

Answer explanation

The code animates the ellipse by changing its vertical position, causing it to move DOWN. The other options refer to changes in width or height, which are not indicated in the code.

Which line has an example a VARIABLE DECLARATION?

• Line 1

• Line 6

• Line 8

Answer explanation

Line 1 contains a variable declaration, which typically includes a type and a variable name. The other lines do not represent variable declarations, making Line 1 the correct choice.

What is the purpose of the variable in this code?

• To store the X-POSITION of the ellipse

• To store the Y-POSITION of the ellipse

• To store the WIDTH of the ellipse

• To store the HEIGHT of the ellipse

Answer explanation

The variable is used to store the Y-POSITION of the ellipse, which determines its vertical placement on the canvas. This is crucial for rendering the ellipse at the correct location.

What color intensity does 100 represent?

fill(120, 50, 100)

• Red

• Green

• Blue

Answer explanation

In the fill(120, 50, 100) function, the parameters represent the RGB color model. The third parameter, 100, corresponds to the intensity of blue. Therefore, 100 represents the color intensity of Blue.

How many times can you REFERENCE* a variable?

*use it in your code

• Once

• Unlimited

Answer explanation

You can reference a variable unlimited times in your code. This allows for flexibility in using the variable throughout your program without any restrictions on the number of times it can be accessed.

Which line has an example a THE VARIABLE BEING USED to draw a shape?

• Line 1

• Line 6

• Line 8

Answer explanation

Line 6 contains a specific variable that is used to define the parameters for drawing a shape, making it the correct choice. The other lines do not provide a clear example of a variable being utilized in this context.

Match equivalent variable updates

• x += 1

• x = x - 2

• x -= 2

• x = x + 1

• x += 2

• x = x - 1

• x -= 1

• x = x + 2