diff --git a/1-exercises/A-undefined/exercise.js b/1-exercises/A-undefined/exercise.js index 0acfc78d..00c992f0 100644 --- a/1-exercises/A-undefined/exercise.js +++ b/1-exercises/A-undefined/exercise.js @@ -13,24 +13,28 @@ let a; console.log(a); +// variable a has no value. // Example 2 function sayHello() { - let message = "Hello"; + let message = "Hello"; } let hello = sayHello(); console.log(hello); +// the function doesn't return anything and there is no value to be assigned to it // Example 3 function sayHelloToUser(user) { - console.log(`Hello ${user}`); + console.log(`Hello ${user}`); } sayHelloToUser(); +// there is no value for the parameter // Example 4 -let arr = [1,2,3]; +let arr = [1, 2, 3]; console.log(arr[3]); +// the index in console.log does not exist in an array diff --git a/1-exercises/B-while-loop/exercise.js b/1-exercises/B-while-loop/exercise.js index b459888f..010fcdf7 100644 --- a/1-exercises/B-while-loop/exercise.js +++ b/1-exercises/B-while-loop/exercise.js @@ -6,7 +6,15 @@ */ function evenNumbers(n) { - // TODO + let num = 0; + let arr = []; + while (n > 0) { + arr.push(num); + num = num + 2; + n--; + } + + console.log(arr); } evenNumbers(3); // should output 0,2,4 diff --git a/1-exercises/C-while-loop-with-array/exercise.js b/1-exercises/C-while-loop-with-array/exercise.js index d584cd75..a4ec0b40 100644 --- a/1-exercises/C-while-loop-with-array/exercise.js +++ b/1-exercises/C-while-loop-with-array/exercise.js @@ -5,19 +5,24 @@ */ const BIRTHDAYS = [ - "January 7th", - "February 12th", - "April 3rd", - "April 5th", - "May 3rd", - "July 11th", - "July 17th", - "September 28th", - "November 15th" + "January 7th", + "February 12th", + "April 3rd", + "April 5th", + "May 3rd", + "July 11th", + "July 17th", + "September 28th", + "November 15th", ]; function findFirstJulyBDay(birthdays) { - // TODO + let index = 0; + while (index < birthdays.length) { + if (birthdays[index].includes("July")) { + return birthdays[index]; + } + index++; + } } - console.log(findFirstJulyBDay(BIRTHDAYS)); // should output "July 11th" diff --git a/1-exercises/D-do-while/exercise.js b/1-exercises/D-do-while/exercise.js index f10d0764..1fc5d431 100644 --- a/1-exercises/D-do-while/exercise.js +++ b/1-exercises/D-do-while/exercise.js @@ -7,9 +7,16 @@ */ function evenNumbersSum(n) { - // TODO + let number = 0; + let sum = 0; + do { + sum = sum + number; + number = number + 2; + n--; + } while (n > 0); + return sum; } console.log(evenNumbersSum(3)); // should output 6 console.log(evenNumbersSum(0)); // should output 0 -console.log(evenNumbersSum(10)); // should output 90 \ No newline at end of file +console.log(evenNumbersSum(10)); // should output 90 diff --git a/1-exercises/E-for-loop/exercise1.js b/1-exercises/E-for-loop/exercise1.js index db5fac64..bab18c8d 100644 --- a/1-exercises/E-for-loop/exercise1.js +++ b/1-exercises/E-for-loop/exercise1.js @@ -4,11 +4,14 @@ Change the while loop below into a for loop. */ - // Change the below code to use a for loop instead of a while loop. -let i = 0; -while(i < 26) { - console.log(String.fromCharCode(97 + i)); - i++; +// let i = 0; +// while(i < 26) { +// console.log(String.fromCharCode(97 + i)); +// i++; +// } + +for (let i = 0; i < 26; i++) { + console.log(String.fromCharCode(97 + i)); } // The output shouldn't change. diff --git a/1-exercises/E-for-loop/exercise2.js b/1-exercises/E-for-loop/exercise2.js index 081002b2..1e2820ec 100644 --- a/1-exercises/E-for-loop/exercise2.js +++ b/1-exercises/E-for-loop/exercise2.js @@ -11,23 +11,20 @@ */ const WRITERS = [ - "Virginia Woolf", - "Zadie Smith", - "Jane Austen", - "Bell Hooks", - "Yukiko Motoya" -] - -const AGES = [ - 59, - 40, - 41, - 63, - 49 + "Virginia Woolf", + "Zadie Smith", + "Jane Austen", + "Bell Hooks", + "Yukiko Motoya", ]; +const AGES = [59, 40, 41, 63, 49]; + // TODO - Write for loop code here +for (let i = 0; i < WRITERS.length; i++) { + console.log(WRITERS[i] + " is " + AGES[i] + " years old"); +} /* The output should look something like this: diff --git a/1-exercises/F-for-of-loop/exercise.js b/1-exercises/F-for-of-loop/exercise.js index 65585c6a..ada7bd0d 100644 --- a/1-exercises/F-for-of-loop/exercise.js +++ b/1-exercises/F-for-of-loop/exercise.js @@ -4,13 +4,20 @@ // TODO Use a for-of loop to output each of the tube stations below. let tubeStations = [ - "Aldgate", - "Baker Street", - "Picadilly Circus", - "Oxford Street", - "Tottenham Court Road" + "Aldgate", + "Baker Street", + "Picadilly Circus", + "Oxford Street", + "Tottenham Court Road", ]; +for (let station of tubeStations) { + console.log(station); +} // TODO Use a for-of loop to capitalise and output each letter in the string seperately. let str = "codeyourfuture"; + +for (let charachter of str) { + console.log(charachter.toUpperCase()); +} diff --git a/2-mandatory/1-weather-report.js b/2-mandatory/1-weather-report.js index dcc2bdb0..49d0c468 100644 --- a/2-mandatory/1-weather-report.js +++ b/2-mandatory/1-weather-report.js @@ -10,54 +10,58 @@ For example, "The temperature in London is 10 degrees" - Hint: you can call the temperatureService function from your function */ +function temparatureString(cityName) { + return ( + "The temperature in " + + cityName + + " is " + + temperatureService(cityName) + + " degrees" + ); +} function getTemperatureReport(cities) { - // TODO + // cities array in cities as parameter + const newTempString = temparatureString; + const citiesTemp = cities.map(newTempString); + return citiesTemp; } - /* ======= TESTS - DO NOT MODIFY ===== */ function temperatureService(city) { - let temparatureMap = new Map(); - - temparatureMap.set('London', 10); - temparatureMap.set('Paris', 12); - temparatureMap.set('Barcelona', 17); - temparatureMap.set('Dubai', 27); - temparatureMap.set('Mumbai', 29); - temparatureMap.set('São Paulo', 23); - temparatureMap.set('Lagos', 33); - - return temparatureMap.get(city); + let temparatureMap = new Map(); + + temparatureMap.set("London", 10); + temparatureMap.set("Paris", 12); + temparatureMap.set("Barcelona", 17); + temparatureMap.set("Dubai", 27); + temparatureMap.set("Mumbai", 29); + temparatureMap.set("São Paulo", 23); + temparatureMap.set("Lagos", 33); + + return temparatureMap.get(city); } test("should return a temperature report for the user's cities", () => { - let usersCities = [ - "London", - "Paris", - "São Paulo" - ] - - expect(getTemperatureReport(usersCities)).toEqual([ - "The temperature in London is 10 degrees", - "The temperature in Paris is 12 degrees", - "The temperature in São Paulo is 23 degrees" - ]); + let usersCities = ["London", "Paris", "São Paulo"]; + + expect(getTemperatureReport(usersCities)).toEqual([ + "The temperature in London is 10 degrees", + "The temperature in Paris is 12 degrees", + "The temperature in São Paulo is 23 degrees", + ]); }); test("should return a temperature report for the user's cities (alternate input)", () => { - let usersCities = [ - "Barcelona", - "Dubai" - ] - - expect(getTemperatureReport(usersCities)).toEqual([ - "The temperature in Barcelona is 17 degrees", - "The temperature in Dubai is 27 degrees" - ]); + let usersCities = ["Barcelona", "Dubai"]; + + expect(getTemperatureReport(usersCities)).toEqual([ + "The temperature in Barcelona is 17 degrees", + "The temperature in Dubai is 27 degrees", + ]); }); test("should return an empty array if the user hasn't selected any cities", () => { - expect(getTemperatureReport([])).toEqual([]); -}); \ No newline at end of file + expect(getTemperatureReport([])).toEqual([]); +}); diff --git a/2-mandatory/2-retrying-random-numbers.js b/2-mandatory/2-retrying-random-numbers.js index 10aab37d..0ae25216 100644 --- a/2-mandatory/2-retrying-random-numbers.js +++ b/2-mandatory/2-retrying-random-numbers.js @@ -5,20 +5,25 @@ // This function shouldn't be changed function generateRandomNumber() { - console.log("Generating number..."); - return Math.round(Math.random() * 100); + console.log("Generating number..."); + return Math.round(Math.random() * 100); } function getRandomNumberGreaterThan50() { - // TODO - implement using a do-while loop + // TODO - implement using a do-while loop + let generateNumber; + do { + generateNumber = generateRandomNumber(); + } while (generateNumber <= 50); + return generateNumber; } /* ======= TESTS - DO NOT MODIFY ===== */ test("Returned value should always be greater than 50", () => { - expect(getRandomNumberGreaterThan50()).toBeGreaterThan(50); - expect(getRandomNumberGreaterThan50()).toBeGreaterThan(50); - expect(getRandomNumberGreaterThan50()).toBeGreaterThan(50); - expect(getRandomNumberGreaterThan50()).toBeGreaterThan(50); - expect(getRandomNumberGreaterThan50()).toBeGreaterThan(50); + expect(getRandomNumberGreaterThan50()).toBeGreaterThan(50); + expect(getRandomNumberGreaterThan50()).toBeGreaterThan(50); + expect(getRandomNumberGreaterThan50()).toBeGreaterThan(50); + expect(getRandomNumberGreaterThan50()).toBeGreaterThan(50); + expect(getRandomNumberGreaterThan50()).toBeGreaterThan(50); }); diff --git a/2-mandatory/3-financial-times.js b/2-mandatory/3-financial-times.js index 2ce6fb73..b25649e6 100644 --- a/2-mandatory/3-financial-times.js +++ b/2-mandatory/3-financial-times.js @@ -5,16 +5,28 @@ Implement the function below, which will return a new array containing only article titles which will fit. */ function potentialHeadlines(allArticleTitles) { - // TODO + // TODO + let shortArticleTitles = []; + for (title of allArticleTitles) { + if (title.length <= 65) shortArticleTitles.push(title); + } + return shortArticleTitles; } - /* The editor of the FT likes short headlines with only a few words! Implement the function below, which returns the title with the fewest words. (you can assume words will always be seperated by a space) */ + function titleWithFewestWords(allArticleTitles) { - // TODO + // TODO + let titleWithFewWords = []; + for (let i = 0; i < allArticleTitles.length; i++) { + wordsOfArticle = allArticleTitles[i].split(""); + titleWithFewWords.push(wordsOfArticle.length); + } + let index = titleWithFewWords.indexOf(Math.min(...titleWithFewWords)); + return allArticleTitles[index]; } /* @@ -23,7 +35,15 @@ function titleWithFewestWords(allArticleTitles) { (Hint: remember that you can also loop through the characters of a string if you need to) */ function headlinesWithNumbers(allArticleTitles) { - // TODO + let newArrWithNumbers = []; + for (let article of allArticleTitles) { + for (let characters of article) { + if (characters >= "0" && characters <= "9") { + newArrWithNumbers.push(article); + } + } + } + return newArrWithNumbers; } /* @@ -31,51 +51,61 @@ function headlinesWithNumbers(allArticleTitles) { Implement the function below to return this number - rounded to the nearest integer. */ function averageNumberOfCharacters(allArticleTitles) { - // TODO -} - + // TODO + let sum = 0; + for (let article of allArticleTitles) { + sum = sum + article.length; + } + return Math.round(sum / allArticleTitles.length); +} /* ======= List of Articles - DO NOT MODIFY ===== */ const ARTICLE_TITLES = [ - "Streaming wars drive media groups to spend more than $100bn on new content", - "Amazon Prime Video India country head: streaming is driving a TV revolution", - "Aerospace chiefs prepare for bumpy ride in recovery of long-haul flights", - "British companies look to muscle in on US retail investing boom", - "Libor to take firm step towards oblivion on New Year's Day", - "Audit profession unattractive to new recruits, says PwC boss", - "Chinese social media users blast Elon Musk over near miss in space", - "Companies raise over $12tn in 'blockbuster' year for global capital markets", - "The three questions that dominate investment", - "Brussels urges Chile's incoming president to endorse EU trade deal", + "Streaming wars drive media groups to spend more than $100bn on new content", + "Amazon Prime Video India country head: streaming is driving a TV revolution", + "Aerospace chiefs prepare for bumpy ride in recovery of long-haul flights", + "British companies look to muscle in on US retail investing boom", + "Libor to take firm step towards oblivion on New Year's Day", + "Audit profession unattractive to new recruits, says PwC boss", + "Chinese social media users blast Elon Musk over near miss in space", + "Companies raise over $12tn in 'blockbuster' year for global capital markets", + "The three questions that dominate investment", + "Brussels urges Chile's incoming president to endorse EU trade deal", ]; /* ======= TESTS - DO NOT MODIFY ===== */ test("should only return potential headlines", () => { - expect(new Set(potentialHeadlines(ARTICLE_TITLES))).toEqual(new Set([ - "British companies look to muscle in on US retail investing boom", - "Libor to take firm step towards oblivion on New Year's Day", - "Audit profession unattractive to new recruits, says PwC boss", - "The three questions that dominate investment" - ])); + expect(new Set(potentialHeadlines(ARTICLE_TITLES))).toEqual( + new Set([ + "British companies look to muscle in on US retail investing boom", + "Libor to take firm step towards oblivion on New Year's Day", + "Audit profession unattractive to new recruits, says PwC boss", + "The three questions that dominate investment", + ]) + ); }); test("should return an empty array for empty input", () => { - expect(potentialHeadlines([])).toEqual([]); + expect(potentialHeadlines([])).toEqual([]); }); test("should return the title with the fewest words", () => { - expect(titleWithFewestWords(ARTICLE_TITLES)).toEqual("The three questions that dominate investment"); + expect(titleWithFewestWords(ARTICLE_TITLES)).toEqual( + "The three questions that dominate investment" + ); }); test("should only return headlines containing numbers", () => { - expect(new Set(headlinesWithNumbers(ARTICLE_TITLES))).toEqual(new Set([ - "Streaming wars drive media groups to spend more than $100bn on new content", - "Companies raise over $12tn in 'blockbuster' year for global capital markets" - ])); + expect(new Set(headlinesWithNumbers(ARTICLE_TITLES))).toEqual( + new Set([ + "Streaming wars drive media groups to spend more than $100bn on new content", + "Companies raise over $12tn in 'blockbuster' year for global capital markets", + ]) + ); }); test("should return the average number of characters in a headline", () => { - expect(averageNumberOfCharacters(ARTICLE_TITLES)).toEqual(65); + expect(averageNumberOfCharacters(ARTICLE_TITLES)).toEqual(65); }); diff --git a/2-mandatory/4-stocks.js b/2-mandatory/4-stocks.js index 72d62f94..5fdb9dd1 100644 --- a/2-mandatory/4-stocks.js +++ b/2-mandatory/4-stocks.js @@ -11,11 +11,11 @@ const STOCKS = ["aapl", "msft", "amzn", "googl", "tsla"]; const CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS = [ - [179.19, 180.33, 176.28, 175.64, 172.99], // AAPL - [340.69, 342.45, 334.69, 333.20, 327.29], // MSFT - [3384.44, 3393.39, 3421.37, 3420.74, 3408.34], // AMZN - [2951.88, 2958.13, 2938.33, 2928.30, 2869.45], // GOOGL - [1101.30, 1093.94, 1067.00, 1008.87, 938.53] // TSLA + [179.19, 180.33, 176.28, 175.64, 172.99], // AAPL + [340.69, 342.45, 334.69, 333.2, 327.29], // MSFT + [3384.44, 3393.39, 3421.37, 3420.74, 3408.34], // AMZN + [2951.88, 2958.13, 2938.33, 2928.3, 2869.45], // GOOGL + [1101.3, 1093.94, 1067.0, 1008.87, 938.53], // TSLA ]; /* @@ -34,7 +34,20 @@ const CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS = [ Functions can help with this! */ function getAveragePrices(closingPricesForAllStocks) { - // TODO + // TODO + let averageArray = []; + for (let average of closingPricesForAllStocks) { + averageArray.push(getAverage(average)); + } + return averageArray; +} + +function getAverage(pricesOfEachStock) { + let sum = 0; + for (let price of pricesOfEachStock) { + sum = sum + price; + } + return Number((sum / 5).toFixed(2)); } /* @@ -48,7 +61,14 @@ function getAveragePrices(closingPricesForAllStocks) { The price change value should be rounded to 2 decimal places, and should be a number (not a string) */ function getPriceChanges(closingPricesForAllStocks) { - // TODO + // TODO + let differenceArray = []; + for (let difference of closingPricesForAllStocks) { + differenceArray.push( + Number((difference[difference.length - 1] - difference[0]).toFixed(2)) + ); + } + return differenceArray; } /* @@ -64,31 +84,41 @@ function getPriceChanges(closingPricesForAllStocks) { The price should be shown with exactly 2 decimal places. */ function highestPriceDescriptions(closingPricesForAllStocks, stocks) { - // TODO + // TODO + let maxArray = []; + for (let i = 0; i < closingPricesForAllStocks.length; i++) { + let maxStocks = Math.max(...closingPricesForAllStocks[i]).toFixed(2); + maxArray.push( + "The highest price of " + + stocks[i].toUpperCase() + + " in the last 5 days was " + + maxStocks + ); + } + return maxArray; } - /* ======= TESTS - DO NOT MODIFY ===== */ test("should return the average price for each stock", () => { - expect(getAveragePrices(CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS)).toEqual( - [176.89, 335.66, 3405.66, 2929.22, 1041.93] - ); + expect(getAveragePrices(CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS)).toEqual([ + 176.89, 335.66, 3405.66, 2929.22, 1041.93, + ]); }); test("should return the price change for each stock", () => { - expect(getPriceChanges(CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS)).toEqual( - [-6.2, -13.4, 23.9, -82.43, -162.77] - ); + expect(getPriceChanges(CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS)).toEqual([ + -6.2, -13.4, 23.9, -82.43, -162.77, + ]); }); test("should return a description of the highest price for each stock", () => { - expect(highestPriceDescriptions(CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS, STOCKS)).toEqual( - [ - "The highest price of AAPL in the last 5 days was 180.33", - "The highest price of MSFT in the last 5 days was 342.45", - "The highest price of AMZN in the last 5 days was 3421.37", - "The highest price of GOOGL in the last 5 days was 2958.13", - "The highest price of TSLA in the last 5 days was 1101.30" - ] - ); + expect( + highestPriceDescriptions(CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS, STOCKS) + ).toEqual([ + "The highest price of AAPL in the last 5 days was 180.33", + "The highest price of MSFT in the last 5 days was 342.45", + "The highest price of AMZN in the last 5 days was 3421.37", + "The highest price of GOOGL in the last 5 days was 2958.13", + "The highest price of TSLA in the last 5 days was 1101.30", + ]); });