Javascript Basics Quiz Review

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(5, 10);

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

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

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

You are splitting up all of your apples equally between 3 people. Which statement below will calculate how many apples will be left over?

• let leftOver = numApples / 3;

• let leftOver = 3 / numApples;

• let leftOver = numApples % 3;

• let leftOver = 3 % numApples;

What would be the correct way to name a function that tells us the day of the week?

• function dayofweek() {

  ...

  }

• function day_of_week() {

  ...

  }

• function DayOfWeek() {

  ...

  }

• function dayOfWeek() {

  ...

  }

Answer explanation

Good job! We use the camel case naming convention in JavaScript functions. Therefore the first letter of the first word is lower case and the first letter of the following words should be upper case.

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)

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

• console.log(distance / time);

• 1. console.log(distance (time 60));

• 1. console.log(distance * time);

Which of the following is part of the navigator’s role in pair-programming?

• 1. defining all of the functions

• 1. focusing on the task at hand

• 1. thinking of alternative ways to solve the problem

• 1. initializing the variables

Answer explanation

Good job! It is the driver’s job to type out all of the code. The navigator’s job includes thinking of alternative, more efficient ways to solve the problem.

What is the output of the following program: (Assume the user enters ‘Florence’ then ‘Fernandez’.)

• 1. Fernandez Florence

• 1. Florence
     Fernandez

• 1. FlorenceFernandez

• 1. Florence Fernandez

Answer explanation

Good job! We didn’t include a space between the first and last name in our wholeName variable or in the console.log command. Be careful when concatenating strings and make sure to double-check your spaces!

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 num apples = 20;

What is printed to the screen if the user enters ‘5’ when the following program is run?

• 5

• 25

• 30

• 50

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

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

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

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

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