Order exercise folders

Ordered the exercise folders by placing their numbers in their folder name

08 calculator/README.md

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+# Exercise 08 - Calculator
+
+The goal for this exercise is to create a calculator that does the following:
+
+add, subtract, get the sum, multiply, get the power, and find the factorial
+
+In order to do this please fill out each function with your solution. Make sure to return the value so you can test it in Jest! To see the expected value
+take a look at the spec file that houses the Jest test cases.

08 calculator/calculator.js

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+const add = function() {
+	
+};
+
+const subtract = function() {
+	
+};
+
+const sum = function() {
+	
+};
+
+const multiply = function() {
+
+};
+
+const power = function() {
+	
+};
+
+const factorial = function() {
+	
+};
+
+module.exports = {
+  add,
+  subtract,
+  sum,
+  multiply,
+  power,
+  factorial
+};

08 calculator/calculator.spec.js

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+const calculator = require('./calculator');
+
+describe('add', () => {
+	test('adds 0 and 0', () => {
+		expect(calculator.add(0,0)).toBe(0);
+	});
+
+	test.skip('adds 2 and 2', () => {
+		expect(calculator.add(2,2)).toBe(4);
+	});
+
+	test.skip('adds positive numbers', () => {
+		expect(calculator.add(2,6)).toBe(8);
+	});
+});
+
+describe('subtract', () => {
+	test.skip('subtracts numbers', () => {
+		expect(calculator.subtract(10,4)).toBe(6);
+	});
+});
+
+describe('sum', () => {
+	test.skip('computes the sum of an empty array', () => {
+		expect(calculator.sum([])).toBe(0);
+	});
+
+	test.skip('computes the sum of an array of one number', () => {
+		expect(calculator.sum([7])).toBe(7);
+	});
+
+	test.skip('computes the sum of an array of two numbers', () => {
+		expect(calculator.sum([7,11])).toBe(18);
+	});
+
+	test.skip('computes the sum of an array of many numbers', () => {
+		expect(calculator.sum([1,3,5,7,9])).toBe(25);
+	});
+});
+
+describe('multiply', () => {
+	test.skip('multiplies two numbers', () => {
+		expect(calculator.multiply([2,4])).toBe(8);
+	});
+
+	test.skip('multiplies several numbers', () => {
+		expect(calculator.multiply([2,4,6,8,10,12,14])).toBe(645120);
+	});
+});
+
+describe('power', () => {
+	test.skip('raises one number to the power of another number', () => {
+		expect(calculator.power(4,3)).toBe(64); // 4 to third power is 64
+	});
+});
+
+describe('factorial', () => {
+	test.skip('computes the factorial of 0', () => {
+		expect(calculator.factorial(0)).toBe(1); // 0! = 1
+	});
+
+	test.skip('computes the factorial of 1', () => {
+		expect(calculator.factorial(1)).toBe(1);
+	});
+
+	test.skip('computes the factorial of 2', () => {
+		expect(calculator.factorial(2)).toBe(2);
+	});
+
+	test.skip('computes the factorial of 5', () => {
+		expect(calculator.factorial(5)).toBe(120);
+	});
+
+	test.skip('computes the factorial of 10', () => {
+		expect(calculator.factorial(10)).toBe(3628800);
+	});
+});