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‎DONE/calculator/README.md

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The goal for this exercise is to create a calculator that does the following:
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add, subtract, get the sum, multiply, get the power, and find the factorial
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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 Jasmine! To see the expected value
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take a look at the spec file that houses the Jasmine test cases.

‎DONE/calculator/calculator.js

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function add (x, y) {
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return x + y;
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}
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function subtract (x, y) {
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return x - y;
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}
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function sum (array) {
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let sum = 0;
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array.forEach(number => {
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sum += number;
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});
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return sum;
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}
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function multiply (array) {
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let product = 1;
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array.forEach(number => {
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product *= number;
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});
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return product;
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}
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function power(x, y) {
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for (let i = y, n = x; i > 1; i--) {
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x *= n;
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}
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return x;
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}
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function factorial(x) {
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return x > 0 ? x * factorial(x - 1) : 1;
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}
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module.exports = {
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add,
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subtract,
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sum,
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multiply,
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power,
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factorial
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}

‎DONE/calculator/calculator.spec.js

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

‎DONE/fibonacci/README.md

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# Exercise XX - fibonacci
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Create a function that returns a specific member of the fibonacci sequence:
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> a series of numbers in which each number ( Fibonacci number ) is the sum of the two preceding numbers. The simplest is the series 1, 1, 2, 3, 5, 8, etc.
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```javascript
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fibonacci(4) // returns the 4th member of the series: 3 (1, 1, 2, 3)
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fibonacci(6) // returns 8
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```

‎DONE/fibonacci/fibonacci.js

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const fibonacci = function(number) {
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if (number < 1) {
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return "OOPS";
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}
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if (typeof number !== 'number') {
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number = parseInt(number);
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}
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let fibonacciArray =[1, 1];
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for (let i = 2; i <= number; i++) {
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fibonacciArray[i] = fibonacciArray[i-2] + fibonacciArray[i-1];
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}
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return fibonacciArray[number-1];
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}
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module.exports = fibonacci

‎DONE/fibonacci/fibonacci.spec.js

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const fibonacci = require('./fibonacci')
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describe('fibonacci', function() {
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it('works', function() {
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expect(fibonacci(4)).toEqual(3);
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});
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it('works', function() {
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expect(fibonacci(6)).toEqual(8);
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});
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it('works', function() {
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expect(fibonacci(10)).toEqual(55);
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});
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it('works', function() {
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expect(fibonacci(15)).toEqual(610);
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});
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it('works', function() {
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expect(fibonacci(25)).toEqual(75025);
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});
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it('doesn\'t accept negatives', function() {
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expect(fibonacci(-25)).toEqual("OOPS");
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});
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it('DOES accept strings', function() {
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expect(fibonacci("1")).toEqual(1);
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});
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it('DOES accept strings', function() {
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expect(fibonacci("2")).toEqual(1);
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});
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it('DOES accept strings', function() {
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expect(fibonacci("8")).toEqual(21);
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});
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});

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