Lab #1 Solution

For this lab, you will be creating several functions and run them in a simple script!

 

You will submit a single file named   lab1.js . In this lab, you will write the 5 functions below, and run them with test input.

sumOfSquares(num1, num2, num3)

 

For your first function, you will calculate the sum of the squares of 3 numbers and return that result. That means

 

2 sumOfSquares(5, 3, 10)  would return   134 .

 

sayHelloTo(firstName, lastName, title);

 

For the second function, you will make a simple function that uses   console.log  to print hello to someone! The interesting thing about this function is that you don't have to have all the inputs to run.

Your function should print a string in the following format:

sayHelloTo(); // throws sayHelloTo("Phil"); // logs: Hello, Phil!

sayHelloTo("Phil", "Barresi"); //logs: Hello, Phil Barresi. I hope you are having a good day!

sayHelloTo("Phil", "Barresi", "Mr."); // logs: Hello, Mr. Phil Barresi! Have a good evening!

 

cupsOfCoffee(howManyCups)

 

 

For the third function, you will create and return a simple song called   99 Cups of Coffee on the Desk . The lyrics of this song grow longer depending on how many cups of coffee there are on the desk. If you run   cupsOfCoffee(5)  it would return:

 

5 cups of coffee on the desk! 5 cups of coffee!

 

Pick one up, drink the cup, 4 cups of coffee on the desk!

 

4 cups of coffee on the desk! 4 cups of coffee!

Pick one up, drink the cup, 3 cups of coffee on the desk!

 

3 cups of coffee on the desk! 3 cups of coffee!

Pick one up, drink the cup, 2 cups of coffee on the desk!

 cups of coffee on the desk! 2 cups of coffee!

 

Pick one up, drink the cup, 1 cup of coffee on the desk!

 

1 cup of coffee on the desk! 1 cup of coffee!

Pick it up, drink the cup, no more coffee left on the desk!

 

Take note for the subtle grammar changes!

 

occurrencesOfSubstring(fullString, substring)

 

For the fourth function, you will calculate how many times a substring occurs in a given string.

For example, calling   countOccurrencesOfSubstring("hello world", "o"); should return   2 , because the letter o appears two times in the string.

However, you must also factor in a case where there are overlaps! When you call

countOccurrencesOfSubstring("Helllllllo, class!", "ll"); should return   6 .

 

randomizeSentences(paragraph)

 

 

For your final function, you will take in a paragraph and randomize the sentences in it.

 

 

var paragraph = "Hello, world! I am a paragraph. You can tell that I am a paragraph because there are multiple sentences that are split up console.log(randomizeSentences(paragraph));

Would print something like:

 

 

You can tell that I am a paragraph because there are multiple sentences that are split up by punctuation marks. I am a paragraph. Grammar c

 

This one is tricky! You'll have to work with string manipulation, and probably an array or two as well.

Error Checking

 

1. Expect and account for bad input, and handle it accordingly! You can   throw "A string describing an error"  when given bad input. You can read about throwing  on the MDN     (https://developer.mozilla.org/en­

US/docs/Web/JavaScript/Reference/Statements/throw)

 

1. You should throw if data is not of an expected type: ie, expecting a number and receiving an integer.

2. You should throw if your data is an out of bounds situation; ie: receiving a negative side length for certain values, or data that does not make sense given the requirements of the function.

 

 

Requirements

 

1. You will have to write each function

2. You must check that all arguments are valid and of the proper type