From bcbc7c4897bde8fd83c85d95b708756dbcb753fe Mon Sep 17 00:00:00 2001 From: Patou Malongi Mabando Date: Mon, 25 Jul 2022 10:25:10 +0200 Subject: [PATCH] ZA2-Patou Mabando-JavaScript-core-1-Coursework-Week3 I resolve Exercises and mandatory --- 1-exercises/A-undefined/exercise.js | 8 +- 1-exercises/B-while-loop/exercise.js | 10 +- .../C-while-loop-with-array/exercise.js | 28 ++++-- 1-exercises/D-do-while/exercise.js | 11 ++- 1-exercises/E-for-loop/exercise1.js | 3 +- 1-exercises/E-for-loop/exercise2.js | 4 +- 1-exercises/F-for-of-loop/exercise.js | 3 + 2-mandatory/1-weather-report.js | 68 +++++++------ 2-mandatory/3-financial-times.js | 98 +++++++++++++------ 2-mandatory/4-stocks.js | 78 ++++++++++----- 10 files changed, 205 insertions(+), 106 deletions(-) diff --git a/1-exercises/A-undefined/exercise.js b/1-exercises/A-undefined/exercise.js index 0acfc78d..3e033714 100644 --- a/1-exercises/A-undefined/exercise.js +++ b/1-exercises/A-undefined/exercise.js @@ -11,7 +11,7 @@ // Example 1 let a; -console.log(a); +console.log(a);// Answer: The variable a is not defined. // Example 2 @@ -20,7 +20,7 @@ function sayHello() { } let hello = sayHello(); -console.log(hello); +console.log(hello);// //Answer: Nothing is returned in this function // Example 3 @@ -28,9 +28,9 @@ function sayHelloToUser(user) { console.log(`Hello ${user}`); } -sayHelloToUser(); +sayHelloToUser();// Hello is not defined. // Example 4 let arr = [1,2,3]; -console.log(arr[3]); +console.log(arr[3]);// Ansewer: Console.log(arr[3]) is undefined because arr element doest not have index 3. diff --git a/1-exercises/B-while-loop/exercise.js b/1-exercises/B-while-loop/exercise.js index b459888f..70744684 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 i = 0; + let numbersList = []; + while (numbersList.length < n) { + if (i % 2 === 0) { + numbersList.push(i); + } + i++; + } + console.log(numbersList.toString()); } 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..413da42c 100644 --- a/1-exercises/C-while-loop-with-array/exercise.js +++ b/1-exercises/C-while-loop-with-array/exercise.js @@ -5,19 +5,27 @@ */ 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 + // TODO + arrayLength = birthdays.length; + i = 0; + while (i < arrayLength) { + if (birthdays[i].includes("July")) { + return birthdays[i]; + } + i++; + } } 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..a09433f1 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 + // TODO + let sum = 0; + let i = 0; + do { + sum += i * 2; + i++; + } while (i < n); + 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..056b5f25 100644 --- a/1-exercises/E-for-loop/exercise1.js +++ b/1-exercises/E-for-loop/exercise1.js @@ -6,8 +6,7 @@ // Change the below code to use a for loop instead of a while loop. -let i = 0; -while(i < 26) { +for (i = 0; i < 26; i++) { console.log(String.fromCharCode(97 + i)); i++; } diff --git a/1-exercises/E-for-loop/exercise2.js b/1-exercises/E-for-loop/exercise2.js index 081002b2..18c8cd44 100644 --- a/1-exercises/E-for-loop/exercise2.js +++ b/1-exercises/E-for-loop/exercise2.js @@ -27,7 +27,9 @@ const AGES = [ ]; // 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..25ec436e 100644 --- a/1-exercises/F-for-of-loop/exercise.js +++ b/1-exercises/F-for-of-loop/exercise.js @@ -14,3 +14,6 @@ let tubeStations = [ // TODO Use a for-of loop to capitalise and output each letter in the string seperately. let str = "codeyourfuture"; +for (let i = 0; i < str.length; i ++) { + console.log(str[i].toUpperCase()) +} diff --git a/2-mandatory/1-weather-report.js b/2-mandatory/1-weather-report.js index dcc2bdb0..8a28483d 100644 --- a/2-mandatory/1-weather-report.js +++ b/2-mandatory/1-weather-report.js @@ -12,52 +12,50 @@ */ function getTemperatureReport(cities) { - // TODO + // TODO + let temperatureReport = []; + for (city of cities) { + let cityTemp = temperatureService(city); + temperatureReport.push(`The temperature in ${city} is ${cityTemp} degrees`); + } + return temperatureReport; } - /* ======= 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/3-financial-times.js b/2-mandatory/3-financial-times.js index 2ce6fb73..cbad3ab0 100644 --- a/2-mandatory/3-financial-times.js +++ b/2-mandatory/3-financial-times.js @@ -5,7 +5,16 @@ Implement the function below, which will return a new array containing only article titles which will fit. */ function potentialHeadlines(allArticleTitles) { - // TODO + // TODO + let headlines = []; + + for (let eachTitle of allArticleTitles) { + if (eachTitle.length <= 65) { + headlines.push(eachTitle); + } + } + + return headlines; } /* @@ -14,7 +23,20 @@ function potentialHeadlines(allArticleTitles) { (you can assume words will always be seperated by a space) */ function titleWithFewestWords(allArticleTitles) { - // TODO + // TODO + let leastWordsTillNow; + let headlineWithLeastWords; + + for (let eachHeadline of allArticleTitles) { + let numberOfWords = eachHeadline.split(" ").length; + + if (leastWordsTillNow === undefined || leastWordsTillNow > numberOfWords) { + leastWordsTillNow = numberOfWords; + headlineWithLeastWords = eachHeadline; + } + } + + return headlineWithLeastWords; } /* @@ -23,7 +45,16 @@ function titleWithFewestWords(allArticleTitles) { (Hint: remember that you can also loop through the characters of a string if you need to) */ function headlinesWithNumbers(allArticleTitles) { - // TODO + // TODO + let headlineTitlesWithNumbers = []; + + for (let eachHeadline of allArticleTitles) { + if (headlineTitleHasNumbers(eachHeadline)) { + headlineTitlesWithNumbers.push(eachHeadline); + } + } + + return headlineTitlesWithNumbers; } /* @@ -31,51 +62,62 @@ function headlinesWithNumbers(allArticleTitles) { Implement the function below to return this number - rounded to the nearest integer. */ function averageNumberOfCharacters(allArticleTitles) { - // TODO -} + // TODO + let characterTotal = 0; + for (let eachTitle of allArticleTitles) { + characterTotal += eachTitle.length; + } + return Math.round(characterTotal / 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..04cde75c 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 +34,19 @@ const CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS = [ Functions can help with this! */ function getAveragePrices(closingPricesForAllStocks) { - // TODO + // TODO + let average = []; + let stockSum = 0; + for (let i = 0; i < closingPricesForAllStocks.length; i++) { + stockSum = 0; + for (let j = 0; j < closingPricesForAllStocks[i].length; j++) { + stockSum = stockSum + closingPricesForAllStocks[i][j]; + } + average.push( + Number((stockSum / closingPricesForAllStocks[i].length).toFixed(2)) + ); + } + return average; } /* @@ -48,7 +60,17 @@ 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 + function getPriceChanges(closingPricesForAllStocks) { // TODO + let priceChangeArr = []; + + for (price of closingPricesForAllStocks) { + let priceChange = Number((price[price.length - 1] - price[0]).toFixed(2)); + priceChangeArr.push(priceChange); + } + return priceChangeArr; + } } /* @@ -64,31 +86,41 @@ function getPriceChanges(closingPricesForAllStocks) { The price should be shown with exactly 2 decimal places. */ function highestPriceDescriptions(closingPricesForAllStocks, stocks) { - // TODO + // TODO + highestPriceLast5Days = []; + for (let i = 0; i < closingPricesForAllStocks.length; i++) { + highestPriceLast5Days.push( + `The highest price of ${stocks[ + i + ].toUpperCase()} in the last 5 days was ${Math.max( + ...closingPricesForAllStocks[i] + ).toFixed(2)}` + ); + } + return highestPriceLast5Days; } - /* ======= 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", + ]); });