Unit 3 Exam | CodeHS

What is a code comment?

• A way to teach Karel a new word

• A way to give notes to the reader to explain what your code is doing

• A message to your teacher in code

• A place to write whatever you want in your code

Why do we use if statements in JavaScript?

• To break out of some block of code

• To do something only if a condition is true

• To do something while a condition is true

• To repeat something for a fixed number of times

Why do we use if/else statements in JavaScript?

• To repeat something for a fixed number of times

• To either do something if a condition is true or do something else

• To break out of some block of code

• To repeat something while a condition is true

Why do we use while loops in JavaScript?

• To break out of some block of code

• To do something if a condition is true

• To repeat some code while a condition is true

• To repeat something for a fixed number of times

Which of the following is an example of a runtime error?

• Karel crashing into a wall

• A command missing a semicolon

• An if/else statement missing a set of parentheses

• A function definition missing a closing curly bracket

The following program is supposed to put down three tennis balls. Where is the logic error?

function main() {
placeThreeBalls();
}
function placeThreeBalls() {
for (let i = 0; i <= 3; i++) {
putBall();
}
}
main();

• line 2

• line 3

• line 5

• line 8

Which of the following is an example of a syntax error?

• Karel tries to pick up a ball, but there is no ball to pick up.

• A for loop uses commas instead of semicolons.

• When run, the program does not match the result world.

• Karel crashes into a wall.

Why should a programmer indent their code?

• Helps show the structure of the code

• Easier for other people to understand

• Indenting is a key part of good programming style

• All of the above

What does "decompose" mean?

• Breaking down your code into more functions.

• Combining your functions.

• Calling a function.

• Defining a function.

What do we use control structures for in JavaScript?

• Control the flow of the program; how the commands execute.

• Start our JavaScript program

• Store information for later

• Teach Karel new commands