Functions

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

Getting Started

1. Fork this repository
2. Clone this repo from your personal GitHub account.
   • Copy the SSH address on the page
   • Run the command: $ git clone [YOUR SSH ADDRESS] to clone this repo onto your computer.
3. Navigate into the exercise folder, e.g. $ cd prep-js-functions.

1. Your work will be entered into the file named functions.js

Below are some specifications for Functions to be built.

1) Declare Two Variables

Declare Two Variables

@variable Datatype: Number a
@variable Datatype: Number b

These two variables will be passed as parameters to the functions that we will write. Parameters are the function's arguments. Parameters allow us to reuse a function with different values. Pay close attention to the other variable names you will create as they will become input to other functions.

2) Function - add

@param Datatype: Number num1
@param Datatype: Number num2
@return Datatype: Number

This function takes two number arguments, num1 and num2. This function returns back a number that is the sum of num1 and num2.

You can test your function by invoking it with two arguments and saving its return value to a variable. Store the return value in a variable named sum. Try invoking it with your previously declared variables!

3) Function - subtract

@param Datatype: Number num1
@param Datatype: Number num2
@return Datatype: Number

This function takes two number arguments, num1 and num2. This function returns back a number that is equal to num2 minus num1. Store the return value in a variable named difference.

Note that you can reuse the same parameter names without issue!

4) Function - multiply

@param Datatype: Number num1
@param Datatype: Number num2
@return Datatype: Number

This function returns the result of multiplying num1 by num2. Store the return value in a variable named product.

5) Function - checkDifference

@param Datatype: Number X
@return Datatype: String

This function returns the string. "My football team lost X times this week", where X is the value of the parameter. Invoke this function using the variable difference as the parameter.

6) Function - checkSum

@param Datatype: Number X
@return Datatype: String

This function returns the string "I CAN ADDZ X NUMBERS" where X is the value of the parameter. Invoke this function using the variable sum as the parameter.

7) Function - checkProduct

@return Datatype: Number

This function does not require any parameters. 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.

Can you see how to use a previously-created function to help?

8) Function - addThenSubtract

@param Datatype: Number numA
@param Datatype: Number numB
@param Datatype: Number numC
@return Datatype: Number

This function takes three Number arguments, 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

9) Function - addThenMultiply

@param Datatype: Number numX
@param Datatype: Number numY
@param Datatype: Number numZ
@return Datatype: Number

This function takes three Number arguments, 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.

10) 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

11) 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 depending on whether 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

12) Function - throwParty

This function checks the value stored at the canDrinkBeer variable. If the value is false, then it should print to a message to the screen: "The Party will have tons of Cake!" If not, then it should print a different message: "This Party will have an open bar."

13) Function - eatFood

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

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.

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

example output: "John Papa loves to eat Pizza"

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

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

14) Function - repeater

This function will return a string to that repeats one of the phrases below 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..."