Reading Code

What does this line of code do?

dist(mouseX, mouseY, 200, 200);

• Checks how far the mouse is from the center of the screen

• Checks if the mouse is clicking on a round button

• Creates a circle with a diameter of 200 on the screen at position mouseX, mouseY

• Changes the size of the canvas to 200, 200

What does this line of code do?

fill(random(255), random(255), random(255), 50);

• Sets the colour of a shape to a random shade of grey

• Sets the colour of a shape to a random transparent colour

• Sets the colour of a line to white

• Sets the colour of a line to a random transparent colour

What does this line of code do?

for (var i = 0; i < nums.length; i++) {

• Repeats for every number that exists

• Loops through all the items in the array nums

• Counts from zero to the size of the canvas

• Nothing - there's an error

What does this line of code do?

speed *= -1;

• Changes the sign of the variable "speed"

• Changes the variable speed to its logical opposite

• Decreases the framerate by 1

• Decreases the speed of an animation by 1

What does this line of code do?

var x = i % 2 === 0;

• Stores the remainder of i / 2 in the variable x

• Makes x true if i is even and false if i is odd

• Calculates half of i and stores it in the variable x

• Assigns x the value 2 and i the value 0

What does this line of code do?

rect(200, 200, 100, mouseX);

• Makes a rectangle that changes width based on the mouse

• Makes a rectangle that changes height based on the mouse

• Makes a rectangle that follows the mouse

• Makes a rectangle that you can only see when the mouse hovers over it

What does this line of code do?

Obj.draw = function() {

• Reassigns the method "draw" of object "Obj" to be a new method

• Creates a function that runs 60 times per second

• Creates a new object prototype

• Changes the way the reserved function "draw" works

Will this code run forever?

while (entry === false) {

• Yes

• No

• It depends what's in the while loop

When will this statement be true? (When will the if statement run)

if (choice === "7" && choice === "V") {

• When choice is equal to "7" or "V"

• Only when choice is "7"

• Only when choice is "V"

• It will never be true

What does this line of code do?

list.push([]);

• Turns list into a new, empty array

• Puts an empty array inside the array called "list"

• Puts everything from a different array variable into the array called "list"

• Nothing - there's an error