JavaScript Basics & Graphics Test

Which of the following commands is a valid Karel command?

• 1. move

• 1. move;

• 1. move();

• 1. move()

What are the horizontal pathways called in a Karel world?

• 1. rows

• 1. points

• 1. columns

• 1. Karel’s position

What are the vertical pathways called in a Karel world?

• rows

• columns

• points

• Karel's position

If Karel starts facing East in the first row, third column, what row and column will Karel be on after this code runs?

move();

move();

move();

turnLeft();

move();

• 1. 
     

     Row 1 and Column 3

• 1. Row 4 and Column 4

• 1. Row 2 and Column 6

• 1. Row 6 and Column 2

What is the purpose of using a for loop in code?

• 1. To do something if a condition is true

• 1. To make programs run faster

• 1. To repeat something a fixed number of times

• 1. To do something while a condition is true

In the following code, what would be a good Postcondition to write?

/* Precondition: Karel is on a spot with a tennis ball facing East

Postcondition: ... /

function getOnTop() {

turnLeft();

move();

turnRight();

}

• 1. Karel is on a spot with a tennis ball facing north

• 1. Karel is facing East.

• 1. Karel ends one spot above a tennis ball facing East.

• 1. Karel is on the same position but on top of a ball.

How can we improve the following program?

function main() {

move();

move();

move();

move();

move();

move();

move();

}

main();

• 1. 
     

     Break down this program into more functions

• 1. Use a for loop to repeat the move command

• 1. Fix the indentation of this program

• 1. Use a while loop to repeat the move command

What is top down design?

• 
  

  Top down design is a way of designing your program by starting with the biggest problem and breaking it down into smaller and smaller pieces that are easier to solve.

• 
  

  Top down design is a way that you can create designs on a computer to put on a web page

• Top down design is a way of designing your programs starting with the individual commands first

• Top down design is a way to use loops and if statements to decompose the problem

A store has 20 apples in its inventory. How can you store this information in a JavaScript variable?

• 1. let numApples == 20;

• 1. 20 = numApples;

• 1. let numApples = 20;

• let num apples = 20;

You want to read input from the user to know how many apples they would like to buy.

Which statement should you use to read in a number from the user?

• let applesToBuy = readInt("How many apples would you like? ");

• let applesToBuy = nextInt("How many apples would you like? ");

• let applesToBuy = console.log("How many apples would you like? ");

• let applesToBuy = readLine("How many apples would you like? ");