Programming Fundamentals Study Guide

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

• Use a while loop to repeat the move command

• Fix the indentation of this program

What makes the following command an invalid Karel command?

turnleft();

• It should end in a colon rather than a semicolon

• The 'l' should be a capital 'L'

• It should start with a capital T

• This command is correct

In the following code below from the Cleanup Karel example, what is the purpose of 'If Statement' #2?

// This program has Karel walk down the

// row and clean up all of the tennis balls

// on the way.

function start() {

while (frontIsClear()) {

// If statement #1

if (ballsPresent()) {

takeBall();

}

move();

}

// If statement #2

if (ballsPresent()) {

takeBall();

}

}

• To move the last time

• To pick up the ball that is in the last spot

• To pick up the ball that is in the last spot, if there is one

• To take the ball from all of the positions that have a ball on them

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

• To do something if a condition is true

• To do something while a condition is true

• To repeat something a fixed number of times

• To make programs run faster

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 the above

What's wrong with this code?

function start() {

move();

go();

go();

}

function go() {

move();

move();

}

function go() {

move();

move();

}

• The go function is called twice

• The go function has a syntax error

• The go function has been defined twice

• go is nota command that Karel understands

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 the proper format for a single line comment in Karel?

• # This is a comment

• // This is a comment

• /* This is a comment

• This is a comment

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

• var numApples == 20;

• 20 = numApples;

• var numApples = 20;

• var num apples = 20;