Add homework exercises for array destructuring + remove class exercises

Author: louisechow

week-3/Homework/mandatory/2-exercises/1-shopping-cart.js

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+const personOne = {
+    name: 'Popeye',
+    age: 34,
+    favouriteFood: 'Spinach'
+}
+
+function introduceYourself(___________________________) {
+    console.log (`Hello, my name is ${name}. I am ${age} years old and my favourite food is ${favouriteFood}.`); 
+}
+
+introduceYourself(personOne);

week-3/Homework/mandatory/2-exercises/2-convertion.js

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+Did you know that destructuring can also be used on objects as well.
+
+We can use destructuring to extract values from an object and assign them to variables in one line.
+
+```
+let person = {
+    firstName: "Bruce",
+    lastName: "Wayne"
+}
+
+let { firstName, lastName} = person;
+
+console.log(`Batman is ${firstName}, ${lastName}`);
+```
+
+The program above will print `Batman is Bruce Wayne`. Notice how we use the `{}` characters since it is an object rather than `[]` which is used when it is an array.
+
+# Exercise
+- What is the syntax to destructure the object `personOne` in exercise-1.js?
+- Update the argument of the function `introduceYourself` to use destructuring on the object that gets passed in.

week-3/Homework/mandatory/2-exercises/3-atm.js

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+let hogwarts = [
+    ['Harry', 'Potter', 'Gryffindor', 'Owl', 'Student'],
+    ['Hermione', 'Granger', 'Gryffindor', 'Cat', 'Student'],
+    ['Draco', 'Malfoy', 'Slytherin', 'None', 'Student'],
+    ['Cedric', 'Diggory', 'HufflePuff', 'None', 'Student'],
+    ['Severus', 'Snape', 'Slytherin', 'None', 'Teacher'],
+    ['Filius', 'Flitwick', 'Ravenclaw', 'None', 'Teacher'],
+    ['Pomona', 'Sprout', 'Hufflepuff', 'None', 'Teacher'],
+    ['Minerva', 'McGonagall', 'Gryffindor', 'None', 'Teacher'],
+    ['Albus', 'Dumbledore', 'Gryffindor', 'Phoenix', 'Teacher']
+]
+

week-3/Homework/mandatory/2-exercises/4-music-player.js

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+
+In `exercise-2.js`, you have an array that contains a list of people who are at Hogwarts School of Witchcraft and Wizardry. 
+For each character you have the following information:
+- First Name
+- Last Name
+- School House
+- Pet
+- Occupation
+
+
+# Exercise 1
+- In `exercise-2.js` write a program that will display the names of the people who belong to the Gryffindor house.
+- Use array destructuring to extract the values you need out of the array.
+
+## Expected result
+```
+Harry Potter
+Ron Weasley
+Hermione Granger
+Minerva McGonagall
+Albus Dumbledore
+```
+
+
+# Exercise 2
+- In `exercise-2.js` write a program that will display the names of teachers who have pets.
+- Use array destructuring to extract the values you need out of the array.
+
+## Expected result
+```
+Albus Dumbledore
+```

week-3/Homework/mandatory/2-exercises/exercise-1/exercise-1.js

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+ let order = [
+     ['Hot cakes', 1, 2.29],
+     ['Apple Pie', 2, 1.39],
+     ['Egg McMuffin', 1, 2.80],
+     ['Sausage McMuffin', 1, 3.00],
+     ['Hot Coffee', 2, 1.00],
+     ['Hash Brown', 4, 0.40]
+ ]
+
+ // Write your code below
+ 

week-3/Homework/mandatory/2-exercises/exercise-1/exercise-1.md

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+# Exercise
+- In `exercise-3.js`, you have been provided with a takeout order. Write a program that will print out the receipt for this order.
+- Use array destructuring to extract the values you need from the order
+- Log each individual item to the console.
+- Log the total cost of the order to the console.
+
+## Expected result
+```
+QTY     ITEM                TOTAL
+1       Hot Cakes           2.29
+2       Apple Pie           2.78
+1       Egg McMuffin        2.80
+1       Sausage McMuffin    3.00  
+2       Hot Coffee          2.00
+4       Hash Brown          1.60
+
+Total: 14.47
+```