Functions

functions.md

Functions

Functions are great, they take data (input), do stuff with that data and then return it to you all shiny and fancy (output).

Below are some specifications for Functions to be built.

Declare Two Variables

• a random Number value
• b random Number value

We will be using both of these variables to pass as parameters to the following functions that we will write. Pay close attention to the other variable names you will create as they will become input to other functions.

Function - add

This function returns the result of adding a and b together. Store this value in a variable named sum.

Function - subtract

This function returns the result of subtracting b from a Store this value in a variable named difference

Function - multiply

This function returns the result of multiplying b by a. Store this value in a variable named product

Function - checkDifference

This function accesses the value stored in the difference variable and uses this number to return the string "My football team lost X times this week", where X is the value stored in difference.

Function - checkSum

This function checks the value stored at sum and uses that number to print to the screen the phrase "I CAN ADDZ X NUMBERS" where X is the value stored in the variable sum .

Function - checkProduct

This function checks the value stored at product and multiplies it by the number stored at difference and then prints the result to the console.

Function - addThenSubtract

This function takes three Number arguments named by you, then adds the first two arguments together. Then with the sum of that operation, subtract the value at the third argument. This function should make use of your previous functions.

example: addThenSubtract(4, 5, 7); //-> returns 2 because 4 + 5 - 7 = 2

Function - addThenMultiply

This function takes three Number arguments named by you, then adds the first two arguments together. Then with the sum of that operation multiply it by the third argument. This function also should make use of your previous functions.

Store the return of this function to a variable named howMany

Function - createFullName

@param Datatype: String firstName
@param Datatype: String lastName 
@return Datatype: String

This function takes two String arguments firstName and lastName. This function returns back a string which represents someone's full name.

Call this function and pass your first and last name into it. Store the return value to a variable named myFullName

Function - verifyDrinkingAge

@param Datatype: Number age
@return Datatype: Boolean

This function takes one Number argument age. This function returns the Boolean value true or false if age is lower than the legal drinking age in the state of Hawaii.

Call this function and pass in a number value. Store the return value to a variable named canDrinkBeer

Function - throwParty

This function checks the value stored at the canDrinkBeer variable and if the value is false it should print to a message to the screen, "The Party will have tons of Cake!" otherwise this message should be "This Party will have an open bar".

Function - eatFood

This function takes 3 arguments firstName, lastName, food and prints out a message to your screen. Internally this function will make use of the createFullName function you created earlier.

exmaple input: if someone called your program like this eatFood( "John", "Papa", "Pizza" )

example output: "John Papa loves to eat Pizza"

exmaple input: if someone called your program like this eatFood( "Peter", "Bojangles", "California Burritos" )

example output: "Peter Bojanglesloves loves to eat California Burritos"

Function - repeater

This function will print to the screen X amount of times. Where X is the value stored at howMany. Inside of this function it will check if the value of canDrinkBeer, if the value is true the message will be "Bacon Pancakes, makin' Bacon Pancakes..." othewise the message will be "Let it go.... LET IT GOOOOOOoOoOoOo..."