Semester Exam Review

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

• let numApples == 20;

• 20 numApples;

• let numApples = 20;

• let applesToBuy

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

Which of the following choices is a properly formed JavaScript variable name, meaning it is both legal in the JavaScript language and considered good style?

• user_age

• UserAge

• userAge

• User age

If you were given the following variables:

let distance = 2;

let time = 30;

What line of code would print the speed in km/hr if the distance is given in km and the time is given in minutes? (Speed = distance / time)

• console.log(distance / (time / 60));

• console.log(distance / time);

• console.log(distance * (time / 60));

• console.log(distance * time);

What symbol do you use to do multiplication in JavaScript?

• x

• X

• *

• #

What will the following code print to the screen?

console.log(2 + 2);

• 2 + 2

• 2

• 4

• 22

Which of the following returns a random decimal number between 1 and 10?

• randomFloat(1, 10);

• randFloat(1, 10);

• Randomizer.float(1, 10);

• Randomizer.nextFloat(1, 10);

What type of data can we NOT randomly generate using the Randomizer ?

• colors

• strings

• booleans

• floats

• integers

If we want to generate a random number where 5 is the smallest number possible and 10 is the largest number possible, which line of code would be correct?

• let rand = Randomizer.nextInt(4, 10);

• 
  

  let rand = Randomizer.nextInt(4, 11);

• let rand = Randomizer.nextInt(5, 11);

• 
  

  let rand = Randomizer.nextInt(5, 10);

What is the correct keyword to create a constant variable?

• constant

• const

• let

• def