Intro to JavaScript

In the Kahn Academy programming environment for Javascript, the bottom left of the drawing window has the coordinates:

• (0,0)

• (400,0)

• (0,400)

• (400,400)

The JavaScript function for drawing an ellipse is:

• elli

• circle

• rect

• ellipse

The following variable declaration declares a:

var value = 12;

• number

• whole number

• string

• decimal value

The following code will :

num +=1

• Take 1 away from num

• Add 1 to the value of num

• Add 2 to the value of num

• Take 2 from the value of num

The following code will:

num -= 4

• Take 4 from the value of num

• Take 1 from the value of num

• Add 4 to the value of num

• Add 1 to the value of num

Draw = function() {

rect(1,1,4,4);

};

• Continuously repeat the drawing of a square

• Continuously repeat the drawing of a circle

• Draw a rectangle once

• draw a rectangle 4 times

What will the following code do?

var x = 0;

draw = function(){

background(1,1,1);

rect(x+=1, 50, 50,50);

};

• Draw a rectangle once

• Animate a square across the screen (left to right)

• Animate a square across the screen (right to left)

• Animate a square across the screen (diagonally)

The noStroke() function disables the outline when drawing shapes:

• True

• False

The following command will:

ellipse(mouseX, mouseY, 30, 30);

• draw an ellipse

• draw a circle

• draw a circle that follows that movement of the mouse

• draw a circle 30 pixels by 30 pixels

Each command line in JavaScript should generally end with a :

• Capital letter

• Semicolon

• Full stop

• Comma