In this lab, we will review two key topics covered so far: Objects and Functions. These are two vital topics for understanding JavaScript fundamentals, and will be used heavily as we build web apps in later units.

Write a function that takes in two numbers as input and returns their average

Input: 4,6
Output: 5

Write a function that takes in three numbers as input and returns their average

Input: 1,3,5
Output: 3

Write a function that takes in an array of numbers as input and returns their average

Input: [1,2,3,4,5,10,10]
Output: 5

Write a function that returns a new array with all even numbers removed.

Input: [1,2,3,4,5,6]
Output: [1,3,5]

BONUS: If you didn't, rewrite this using an array method with a callback

Write a function that checks to see whether every number in an array is positive.

Input: [-4,3,-2,4]
Output: false

BONUS: If you didn't, rewrite this using an array method with a callback

Write a function that lowercases all strings in an array of strings.

Input: ["HELLO", "THERE", "THESE", "ARE", "SOME", "STRINGS"]
Output: ["hello", "there", "these", "are", "some", "strings"]

BONUS:

• A. If you didn't, rewrite this using an array method with a callback

• B. Make it work even if the array has mixed types inside so that input = [1, 'HELLO', {one: 'uno'}] would give output = ['hello']

Write a function that combines an array of strings into a single string separated by spaces.

Input: ["It’s", "not", "a", "bug.", "It’s", "an", "undocumented", "feature!"]
Output: "It’s not a bug. It’s an undocumented feature!""

Write a function that returns a random integer between 1 and n

Input: 7
Output: 3

Bonus: Your function should return 1 or 7 inclusive

Write a function that returns the sum of the absolute values of an array

Input: [3,-4,5,-6]
Output: 18

Write a function that converts a temperature in Fahrenheit to Celsius

Input: 212
Output: 100

1. Write an object that represents a User. It should have a property for the user's name, email address, and age.

2. Make 3 different user objects and store them in an array

3. Write a function that takes in an array of User objects, and returns an array with only their email addresses

4. Write a function that takes in an array of User objects, and returns the average age of all users. Rounded down.

5. Write a function that takes in an array of User objects and returns whether or not all users have an age greater than 18

6. Write an object that represents a Recipe. It should have a property for the recipe's ingredients, name, and how long it will take to make.

7. Make 3 different recipe objects and store them in an array.

8. Write a function that takes in an array of Recipe objects and returns the recipe that will take the least amount of time to make.

9. Write a function that takes in an array of Recipe objects and returns an array containing all the ingredients you need to make all of the recipes.

Bonus: Remove duplicate ingredients from the final array

10. Write a function that takes in an array of Recipe objects and an array of ingredients and returns all the recipes that you are able to make.