JS Programing - Khan akademy basic

Question 1

How many types of variables do you know?

Answer 1

1. One value variable
2. Arrays []
3. Objects { }
4. Function () {}

Question 2

How do you debug, what function do you use?

Answer 2

Println ()

Question 3

How do you Draw: a line, a rectangle, an ellipse, a circle

Answer 3

line (x, y, Hight, With)

rect (x, y, Hight, With)

ellipse (x, y, Hight, With)

ellipse (x, y, Hight, Hight)

Question 4

What function is looping continuously (used for animation)?

Answer 4

Draw () { };

Question 5

What loop functions do you know?

Answer 5

While ( ) { }

For ( ) { }

Draw ( ) { }

Question 6

How do you call a “For” function and what is it’s structure?

Answer 6

It is a Loop Function

For (var i=1; i>10; i++) { };

Question 7

How do you call a while function and what is it’s structure?

Answer 7

It is a Loop function.

Var i=1;

while (i<10) {

i++;

};

Question 8

Do you know any conditional statement?

Answer 8

The if () { } statement.

Question 9

What is the structure of the if statement. What other if structures are available in Java Script?

Answer 9

if (condition is true) { };

If (condition) { }; else { };

if (condition) { }; else if (condition) { }; else { };

Question 10

What function will deliver the x and y coordinates of the mouse’s position?

Answer 10

Mouse X

Mouse Y

Question 11

What conditional function is true if the mouse is pressed?

Answer 11

MouseIsPressed ();

Question 12

How can you incerease or decrease the value of a variable (i) by 1?

Answer 12

i = i + 1; i = i - 1;

i++; i–;

Question 13

What type of data do you know?

Answer 13

text

integer

boolean

Question 14

From where did the boolean data type got its name and what values can it have?

Answer 14

The name is from George Boolean.

Values: True False

Question 15

How can you incerease the value of a variable (i) by 14

How can you decrease the value of a variable (i) by 14

Answer 15

i = i + 14; i = i - 14;

i += 14; i -= 14

Question 16

What operators do you use to check if two values are equal?

What operators do you use to check if two values are NOT equal?

Answer 16

i === y;

i !== y;

Question 17

What operators do you use for AND?

Answer 17

&&

Question 18

What operator do you use for OR?

Answer 18

||

Question 19

How can you round a number up?

Answer 19

Ceiling ()

Round () - if the number is equal or higher that 0.5

Question 20

How can you round a number down?

Answer 20

Floor ();

Round () - if the number is lower than 0.5

Question 21

How do you make an object without a contour?

Answer 21

noStroke ();

Question 22

How do you write a text in JS?

Answer 22

text (x, y, hight, with)

Question 23

What is the structure of a function?

Answer 23

Without input: () { };

With input: function (data1, data2, …) { };