Lab 09 - JavaScript Functions

In this lab, you’ll be creating several programs:

1. greetings
2. pluralize
3. double
4. factorial

Instructions

Setup

ProTip: Bookmark the following page so that you can easily repeat these steps in your future labs!

Cloning a Remote Repo Using Your GitHub API Access Token

• On GitHub, create and name your new repository lab-09-functions and clone it inside your /mtec1003 folder.
• Once you've completed the steps at the link above, you're ready to begin.
  Open up your text editor (e.g. Atom, Sublime Text, etc.)...
• Note: ALL FILES YOU CREATE BELOW MUST BE SUBMITTED IN YOUR NEW REPOSITORY THIS WEEK.

Note: ALL SOLUTIONS TO THESE PROBLEMS MUST BE SHOWN IN THE FORM OF A FUNCTION DEFINITION AND A CALL TO THAT FUNCTION.

greetings

Write a program that says hello three times.

• using your text editor (e.g. SublimeText, Atom, VS Code, etc.), create a new file called greetings.html in your repository directory: ~/myClasses/mtec1003/lab-10-functions/
• setup an html file, and add script tags… start writing your JavaScript between the script tags
• the program should say “hello” FIVE times in the JavaScript console
• do this by DEFINING a function called greet()
• the greet() function will print out hello exactly once
• CALL the greet() function five times
• use git status, add, commit, and push to save your file in version control and submit it
• example output below…

hello
hello
hello
hello
hello

pluralize

Write a program that creates a plural version of a word inputted by a user.

• using your text editor (e.g. SublimeText, Atom, VS Code, etc.), create a new file called pluralize.html in your repository directory: ~/myClasses/mtec1003/lab-10-functions/
• setup an html file, and add script tags… start writing your JavaScript between the script tags
• define a function called pluralize(word)
• it should have one parameter, word
• it should give back a value - the plural version of the word passed in
• ask for a word: “Word please:”
• it should call your pluralize function
• pluralize will give back the word with an s appended to the end of it
• use the result of calling your pluralize function to print the plural version to the JavaScript console
• add an if-else-if statement to handle the following words: moose (moose), automaton (automata), mouse (mice)
• use git status, add, commit, and push to save your file in version control and submit it
• example interaction is below (everything after the greater than sign (>) is user input using the prompt function):

(prompt) Word please:
> car
cars

double

Write a program that calculates the twice of a number entered by the user and prints it to the console log. The function should be called - double(n). First define the function. Then ask the user for a input of a number to be doubled. Then parseInt that input value and then use it in a function call to double(n).

factorial

Write a program that calculates the factorial of a number entered by the user. Factorial is the product of all positive integers less than or equal to a number. 4! (or 4 factorial) = 4 * 3 * 2 * 1 = 24

• using your text editor (e.g. SublimeText, Atom, VS Code, etc.), create a new file called factorial.html in your repository directory: ~/myClasses/mtec1003/lab-10-functions/
• setup an html file, and add script tags… start writing your JavaScript between the script tags
• define a function called factorial(n)
• it should have one parameter, n
• it should give back an number - the product of all positive numbers less than or equal to the user input
• ask for a word: “Number please::”
• it should then CALL your factorial function
• factorial will give back the result of the calculation
• use the result of calling your factorial function to print the factorial
• hint: use a for loop to do this and use the function that returns a number from a string
• example interaction is below (everything after the greater than sign (>) is user input using the prompt function):

(prompt) Number please:
> 4
24