CodeHS Intro to Programming - Karel Review

Which of the following commands is a valid Karel command?

• turnLeft

• turnLeft;

• turnLeft();

• turnLeft()

What makes this command invalid (incorrect)?

Move();

• This command is correct.

• It has a capital M.

• It has ()

• It should be a colon : not a semi colon ;

Which of the following is the correct way to define a turnRight function in Karel?

• function turnRight() { turnLeft(); turnLeft(); turnLeft();

  }

• function turnRight() { turnRight(); turnRight(); turnRight();

  }

• function turnRight { turnLeft(); turnLeft(); turnLeft();

  }

• turnRight function() { turnLeft(); turnLeft(); turnLeft();

  }

Why do we use functions in Karel programs?

• Break down our program into smaller parts

• Avoid repeating code

• Make our program more readable

• All of these!

How many total times will Karel move in this program?

function start() { move(); for (var i = 0; i < 5; i++) { move(); putBall(); } }

• 1

• 5

• 6

• 7

What is wrong with this for loop?

for (var i = 0; i < 10; i + 1) { move(); }

• The for loop uses commas instead of semicolons

• It should say i++ instead of i + 1

• Nothing is wrong with this loop

• The "var" should not be there.

How can we teach Karel new commands?

• For loop

• While loop

• Define a new function

• The start function

Say you want to write a program to have Karel put down 300 tennis balls. Which control structure would you use?

• If statement

• While loop

• For loop

How can we improve the following program?

function start() { move(); move(); move(); move(); move(); move(); move(); move(); move(); }

• Break down this program into more functions

• Use a for loop to repeat the move command

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

• To do something if a condition is true

• To repeat something a fixed number of times

• To make programs run faster