8000 Merge pull request #234 from thatblindgeye/update_solutions · sabs/javascript-exercises@8dfb7e4 · GitHub
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Merge pull request TheOdinProject#234 from thatblindgeye/update_solutions
Exercises: Add solution directories for all exercises
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‎01_helloWorld/solution/helloWorld-solution.js

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const helloWorld = function () {
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return "Hello, World!";
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};
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module.exports = helloWorld;

‎01_helloWorld/solution/helloWorld-solution.spec.js

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const helloWorld = require('./helloWorld-solution');
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describe('Hello World', function () {
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test('says "Hello, World!"', function () {
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expect(helloWorld()).toEqual('Hello, World!');
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});
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});

‎02_repeatString/solution/repeatString-solution.js

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const repeatString = function (word, times) {
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if (times < 0) return "ERROR";
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let string = "";
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for (let i = 0; i < times; i++) {
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string += word;
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}
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return string;
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};
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module.exports = repeatString;

‎02_repeatString/solution/repeatString-solution.spec.js

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const repeatString = require('./repeatString-solution');
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describe('repeatString', () => {
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test('repeats the string', () => {
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expect(repeatString('hey', 3)).toEqual('heyheyhey');
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});
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test('repeats the string many times', () => {
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expect(repeatString('hey', 10)).toEqual('heyheyheyheyheyheyheyheyheyhey');
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});
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test('repeats the string 1 times', () => {
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expect(repeatString('hey', 1)).toEqual('hey');
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});
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test('repeats the string 0 times', () => {
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expect(repeatString('hey', 0)).toEqual('');
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});
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test('returns ERROR with negative numbers', () => {
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expect(repeatString('hey', -1)).toEqual('ERROR');
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});
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test('repeats the string a random amount of times', function () {
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/*The number is generated by using Math.random to get a value from between
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0 to 1, when this is multiplied by 1000 and rounded down with Math.floor it
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equals a number between 0 to 999 (this number will change everytime you run
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the test).*/
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// DO NOT use Math.floor(Math.random() * 1000) in your code,
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// this test generates a random number, then passes it into your code with a function parameter.
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// If this doesn't make sense, you should go read about functions here: https://www.theodinproject.com/paths/foundations/courses/foundations/lessons/fundamentals-part-3
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const number = Math.floor(Math.random() * 1000);
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/*The .match(/((hey))/g).length is a regex that will count the number of heys
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in the result, which if your function works correctly will equal the number that
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was randomaly generated. */
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expect(repeatString('hey', number).match(/((hey))/g).length).toEqual(
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number
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);
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});
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test('works with blank strings', () => {
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expect(repeatString('', 10)).toEqual('');
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});
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});

‎03_reverseString/solution/reverseString-solution.js

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const reverseString = function (string) {
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return string.split("").reverse().join("");
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};
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module.exports = reverseString;

‎03_reverseString/solution/reverseString-solution.spec.js

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const reverseString = require('./reverseString-solution');
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describe('reverseString', () => {
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test('reverses single word', () => {
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expect(reverseString('hello')).toEqual('olleh');
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});
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test('reverses multiple words', () => {
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expect(reverseString('hello there')).toEqual('ereht olleh');
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});
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test('works with numbers and punctuation', () => {
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expect(reverseString('123! abc!')).toEqual('!cba !321');
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});
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test('works with blank strings', () => {
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expect(reverseString('')).toEqual('');
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});
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});

‎04_removeFromArray/solution/removeFromArray-solution.js

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// we have 2 solutions here, an easier one and a more advanced one.
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// The easiest way to get an array of the rest of the arguments that are passed to a function
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// is using the rest operator. If this is unfamiliar to you look it up!
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const removeFromArray = function (array, ...args) {
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// create a new empty array
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const newArray = [];
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// use forEach to go through the array
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array.forEach((item) => {
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// push every element into the new array
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// UNLESS it is included in the function arguments
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// so we create a new array with every item, except those that should be removed
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if (!args.includes(item)) {
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newArray.push(item);
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}
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});
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// and return that array
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return newArray;
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};
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// A simpler, but more advanced way to do it is to use the 'filter' function,
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// which basically does what we did with the forEach above.
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// var removeFromArray = function(array, ...args) {
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// return array.filter(val => !args.includes(val))
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// }
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//
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module.exports = removeFromArray;

‎04_removeFromArray/solution/removeFromArray-solution.spec.js

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const removeFromArray = require('./removeFromArray-solution');
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describe('removeFromArray', () => {
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test('removes a single value', () => {
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expect(removeFromArray([1, 2, 3, 4], 3)).toEqual([1, 2, 4]);
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});
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test('removes multiple values', () => {
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expect(removeFromArray([1, 2, 3, 4], 3, 2)).toEqual([1, 4]);
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});
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test('ignores non present values', () => {
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expect(removeFromArray([1, 2, 3, 4], 7, 'tacos')).toEqual([1, 2, 3, 4]);
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});
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test('ignores non present values, but still works', () => {
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expect(removeFromArray([1, 2, 3, 4], 7, 2)).toEqual([1, 3, 4]);
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});
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test('can remove all values', () => {
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expect(removeFromArray([1, 2, 3, 4], 1, 2, 3, 4)).toEqual([]);
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});
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test('works with strings', () => {
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expect(removeFromArray(['hey', 2, 3, 'ho'], 'hey', 3)).toEqual([2, 'ho']);
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});
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test('only removes same type', () => {
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expect(removeFromArray([1, 2, 3], '1', 3)).toEqual([1, 2]);
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});
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});

‎05_sumAll/solution/sumAll-solution.js

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const sumAll = function (min, max) {
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if (!Number.isInteger(min) || !Number.isInteger(max)) return "ERROR";
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if (min < 0 || max < 0) return "ERROR";
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if (min > max) {
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const temp = min;
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min = max;
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max = temp;
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}
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let sum = 0;
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for (let i = min; i < max + 1; i++) {
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sum += i;
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}
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return sum;
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};
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module.exports = sumAll;

‎05_sumAll/solution/sumAll-solution.spec.js

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const sumAll = require('./sumAll-solution');
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describe('sumAll', () => {
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test('sums numbers within the range', () => {
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expect(sumAll(1, 4)).toEqual(10);
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});
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test('works with large numbers', () => {
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expect(sumAll(1, 4000)).toEqual(8002000);
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});
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test('works with larger number first', () => {
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expect(sumAll(123, 1)).toEqual(7626);
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});
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test('returns ERROR with negative numbers', () => {
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expect(sumAll(-10, 4)).toEqual('ERROR');
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});
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test('returns ERROR with non-integer parameters', () => {
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expect(sumAll(2.5, 4)).toEqual('ERROR');
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});
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test('returns ERROR with non-number parameters', () => {
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expect(sumAll(10, '90')).toEqual('ERROR');
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});
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test('returns ERROR with non-number parameters', () => {
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expect(sumAll(10, [90, 1])).toEqual('ERROR');
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});
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});

‎06_leapYears/solution/leapYears-solution.js

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const leapYears = function (year) {
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return year % 4 === 0 && (year % 100 !== 0 || year % 400 === 0);
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};
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module.exports = leapYears;

‎06_leapYears/solution/leapYears-solution.spec.js

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const leapYears = require('./leapYears-solution');
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describe('leapYears', () => {
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test('works with non century years', () => {
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expect(leapYears(1996)).toBe(true);
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});
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test('works with non century years', () => {
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expect(leapYears(1997)).toBe(false);
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});
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test('works with ridiculously futuristic non century years', () => {
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expect(leapYears(34992)).toBe(true);
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});
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test('works with century years', () => {
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expect(leapYears(1900)).toBe(false);
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});
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test('works with century years', () => {
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expect(leapYears(1600)).toBe(true);
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});
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test('works with century years', () => {
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expect(leapYears(700)).toBe(false);
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});
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});

‎07_tempConversion/solution/tempConversion-solution.js

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const convertToCelsius = function (fahrenheit) {
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return Math.round((fahrenheit - 32) * (5 / 9) * 10) / 10;
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};
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const convertToFahrenheit = function (celsius) {
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return Math.round(((celsius * 9) / 5 + 32) * 10) / 10;
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};
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module.exports = {
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convertToCelsius,
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convertToFahrenheit,
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};

‎07_tempConversion/solution/tempConversion-solution.spec.js

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const {
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convertToCelsius,
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convertToFahrenheit,
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} = require('./tempConversion-solution');
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describe('convertToCelsius', () => {
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test('works', () => {
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expect(convertToCelsius(32)).toEqual(0);
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});
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test('rounds to 1 decimal', () => {
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expect(convertToCelsius(100)).toEqual(37.8);
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});
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test('works with negatives', () => {
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expect(convertToCelsius(-100)).toEqual(-73.3);
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});
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});
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describe('convertToFahrenheit', () => {
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test('works', () => {
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expect(convertToFahrenheit(0)).toEqual(32);
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});
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test('rounds to 1 decimal', () => {
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expect(convertToFahrenheit(73.2)).toEqual(163.8);
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});
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test('works with negatives', () => {
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expect(convertToFahrenheit(-10)).toEqual(14);
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});
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});

‎08_calculator/solution/calculator-solution.js

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const add = function (a, b) {
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return a + b;
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};
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const subtract = function (a, b) {
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return a - b;
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};
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const sum = function (array) {
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return array.reduce((total, current) => total + current, 0);
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};
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const multiply = function (array) {
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return array.length
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? array.reduce((accumulator, nextItem) => accumulator * nextItem)
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: 0;
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};
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const power = function (a, b) {
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return Math.pow(a, b);
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};
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const factorial = function (n) {
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if (n === 0) return 1;
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let product = 1;
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for (let i = n; i > 0; i--) {
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product *= i;
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}
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return product;
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};
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// This is another implementation of Factorial that uses recursion
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// THANKS to @ThirtyThreeB!
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const recursiveFactorial = function (n) {
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if (n === 0) {
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return 1;
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}
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return n * recursiveFactorial(n - 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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};

‎08_calculator/solution/calculator-solution.spec.js

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

‎09_palindromes/solution/palindromes-solution.js

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const palindromes = function (string) {
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const processedString = string.toLowerCase().replace(/[^a-z]/g, "");
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return processedString.split("").reverse().join("") == processedString;
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};
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module.exports = palindromes;

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