CodeYourFuture · hanakisu · Aug 18, 2022 · michellejanay · Aug 19, 2022
diff --git a/1-exercises/A-undefined/exercise.js b/1-exercises/A-undefined/exercise.js
@@ -1,8 +1,10 @@
 /*
-    By now, you would have already seen "undefined", either in an error message or being output from your program.
+    By now, you would have already seen "undefined", 
+    either in an error message or being output from your program.
     But what does it mean? undefined represents the absence of a value.
 
-    In some cases, undefined will be used by a programmer intentionally, and they will write code to handle it.
+    In some cases, undefined will be used by a programmer intentionally, 
+    and they will write code to handle it.
     But usually, when you see undefined - it means something has gone wrong!
 
     Below are 4 typical examples of when you would see undefined.
@@ -11,7 +13,7 @@
 
 // Example 1
 let a;
-console.log(a);
+console.log(a);// 'a' has already been declared
 
 
 // Example 2

diff --git a/1-exercises/B-while-loop/exercise.js b/1-exercises/B-while-loop/exercise.js
@@ -1,13 +1,26 @@
 /*
-    while loops can be useful when you want to execute some code as long as some condition is true.    
+    while loops can be useful when you want to execute some code as long as some condition 
+    is true.    
 
-    Using a while loop, complete the function below so it logs (using console.log) the first n even numbers as a comma-seperated string.
+    Using a while loop, complete the function below so it logs (using console.log) 
+    the first n even numbers as a comma-seperated string.
     The list of numbers should start with 0. n is being passed in as a parameter.
 */
 
 function evenNumbers(n) {
-    // TODO
+    let startnum = [];
+    let i = 0;
+    while (n > startnum.length) {
+        if (i % 2 === 0) {
+            startnum.push(i);
+        }
+        i++;
+    }
+
+    console.log(startnum);
 }
+
+
 
 evenNumbers(3); // should output 0,2,4
 evenNumbers(0); // should output nothing

diff --git a/1-exercises/C-while-loop-with-array/exercise.js b/1-exercises/C-while-loop-with-array/exercise.js
@@ -1,7 +1,9 @@
 /*
     Loops can be useful when working with arrays.
-    In the below example, imagine we've defined an array holding the birthdays of your closest friends.
-    Use a while loop to search through the array until you find the first birthday in July, then return that birthday from the function.
+    In the below example, imagine we've defined an array holding the birthdays of your
+     closest friends.
+    Use a while loop to search through the array until you find the first birthday in July,
+     then return that birthday from the function.
 */
 
 const BIRTHDAYS = [
@@ -17,7 +19,20 @@ const BIRTHDAYS = [
 ];
 
 function findFirstJulyBDay(birthdays) {
-    // TODO
+    let i = 0;
+    while (i < birthdays.length) {
+        let months = birthdays[i].substr(0, 4);
+        if (months === "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
@@ -8,6 +8,17 @@
 
 function evenNumbersSum(n) {
     // TODO
+    let i = 0;
+    const evenNum = [];
+    do {
+        if (i % 2 === 0) {
+            evenNum.push(i);
+        }
+        i++
+    } while (n > evenNum.length)
+
+    let sum = evenNum.reduce((acc, curr) => acc + curr, 0);
+    return sum;
 }
 
 console.log(evenNumbersSum(3)); // should output 6

diff --git a/1-exercises/E-for-loop/exercise1.js b/1-exercises/E-for-loop/exercise1.js
@@ -7,8 +7,10 @@
 
 // Change the below code to use a for loop instead of a while loop.
 let i = 0;
-while(i < 26) {
+for (let i = 0; i < 26; i++) {
     console.log(String.fromCharCode(97 + i));
-    i++;
 }
+//while(i < 26) {
+
+
 // The output shouldn't change.
diff --git 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
@@ -2,6 +2,7 @@
     A for-of loop is a easy and way of looping through the elements of an array, string or any other "iterable object" (think sequence of elements).    
 */
 
+
 // TODO Use a for-of loop to output each of the tube stations below.
 let tubeStations = [
     "Aldgate",
@@ -11,6 +12,12 @@ let tubeStations = [
     "Tottenham Court Road"
 ];
 
-
+for (let arr of tubeStations) {
+    console.log(arr);
+}
 // TODO Use a for-of loop to capitalise and output each letter in the string seperately.
+
 let str = "codeyourfuture";
+for (arr of str) {
+    console.log(arr.toUpperCase())
+}
diff --git a/2-mandatory/1-weather-report.js b/2-mandatory/1-weather-report.js
@@ -2,7 +2,8 @@
     Imagine we're making a weather app!
 
     We have a list of cities that the user wants to track.
-    We also already have a temperatureService function which will take a city as a parameter and return a temparature.
+    We also already have a temperatureService function which will take a city as a
+     parameter and return a temparature.
 
     Implement the function below:
         - take the array of cities as a parameter
@@ -12,7 +13,11 @@
 */
 
 function getTemperatureReport(cities) {
-    // TODO
+    for (let i = 0; i < cities.length; i++) {
+        let temp = temperatureService(cities[i])
+        cities[i] = "The temperature in " + cities[i] + " is " +temp + " degrees";
+    }
+    return cities;
 }
 
 

diff --git a/2-mandatory/2-retrying-random-numbers.js b/2-mandatory/2-retrying-random-numbers.js
@@ -1,5 +1,6 @@
 /*
-    In the below example, we want to keep calling generateRandomNumber until we get a value that is > 50.
+    In the below example, we want to keep calling generateRandomNumber until we get
+     a value that is > 50.
     Implement this using a do-while loop.
 */
 
@@ -11,6 +12,11 @@ function generateRandomNumber() {
 
 function getRandomNumberGreaterThan50() {
     // TODO - implement using a do-while loop
+    let i = 0;
+    do { 
+        i = generateRandomNumber();
+    }while(i < 50)
+    return i;
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */

diff --git a/2-mandatory/3-financial-times.js b/2-mandatory/3-financial-times.js
@@ -1,11 +1,20 @@
 /*
-    Imagine you are working on the Financial Times web site! They have a list of article titles stored in an array.
+    Imagine you are working on the Financial Times web site! 
+    They have a list of article titles stored in an array.
 
-    The home page of the web site has a headline section, which only has space for article titles which are 65 characters or less.
-    Implement the function below, which will return a new array containing only article titles which will fit.
+    The home page of the web site has a headline section,
+     which only has space for article titles which are 65 characters or less.
+    Implement the function below, 
+    which will return a new array containing only article titles which will fit.
 */
 function potentialHeadlines(allArticleTitles) {
-    // TODO
+    let result = [];        
+    for (let i = 0; i < allArticleTitles.length; i++) {
+        if (allArticleTitles[i] <= 65) {
+            result.push(allArticleTitles[i])
+        }   
+    }
+    return result;
 }
 
 /*
@@ -14,24 +23,61 @@ function potentialHeadlines(allArticleTitles) {
     (you can assume words will always be seperated by a space)
 */
 function titleWithFewestWords(allArticleTitles) {
-    // TODO
+    let result = "";
+    let spaceCount = 1000;
+    for (let i = 0; i < allArticleTitles.length; i++) {       
+        var wordSpaceCount = (allArticleTitles[i].split(" ").length - 1);
+        console.log( allArticleTitles[i] + " has a space " + wordSpaceCount)
+        if (wordSpaceCount < spaceCount) {
+            spaceCount = wordSpaceCount;
+            result = allArticleTitles[i];           
+        }
+    }
+    return result;
 }
 
 /*
-    The editor of the FT has realised that headlines which have numbers in them get more clicks!
-    Implement the function below to return a new array containing all the headlines which contain a number.
-    (Hint: remember that you can also loop through the characters of a string if you need to)
+    The editor of the FT has realised that headlines which have numbers 
+    in them get more clicks!
+    Implement the function below to return a new array containing 
+    all the headlines which contain a number.
+    (Hint: remember that you can also loop through the characters 
+        of a string if you need to)
 */
 function headlinesWithNumbers(allArticleTitles) {
     // TODO
+    let result = [];
+    for (let i = 0; i < allArticleTitles.length; i++) {
+        let innersentece = allArticleTitles[i]
+        for (let j = 0; j < innersentece.length; j++){
+            let value = innersentece[j]
+            if (!isNaN(value) && value != " ") 
+            {
+                 result.push(innersentece)
+                 break;
+             }            
+        }
+    }
+    return result;
 }
 
 /*
-    The Financial Times wants to understand what the average number of characters in an article title is.
-    Implement the function below to return this number - rounded to the nearest integer.
+    The Financial Times wants to understand what the average number of characters 
+    in an article title is.
+    Implement the function below to return this number - rounded to the 
+    nearest integer.
 */
 function averageNumberOfCharacters(allArticleTitles) {
-    // TODO
+    let sum = 0
+    if (allArticleTitles.length == 0) {
+        return 0
+    }
+    for (let i = 0; i < allArticleTitles.length; i++) {
+        sum = sum + allArticleTitles[i].length;
+    }
+    let average = 0
+    average = sum / allArticleTitles.length
+    return average.toFixed(0)
 }
 
 

diff --git a/2-mandatory/4-stocks.js b/2-mandatory/4-stocks.js
@@ -3,8 +3,10 @@
 
     Imagine we a working for a finance company. Below we have:
         - an array of stock tickers
-        - an array of arrays containing the closing price for each stock in each of the last 5 days.
-            For example, CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS[2] contains the prices for the last 5 days for STOCKS[2] (which is amzn)
+        - an array of arrays containing the closing price for each stock in each of the 
+        - last 5 days.
+        For example, CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS[2] contains the prices 
+        for the last 5 days for STOCKS[2] (which is amzn)
 */
 
 /* ======= Stock data - DO NOT MODIFY ===== */
@@ -21,50 +23,88 @@ const CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS = [
 /*
     We want to understand what the average price over the last 5 days for each stock is.
     Implement the below function, which
-        - Takes this CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS array as input (remember, it's an array of arrays)
+        - Takes this CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS array as input
+         (remember, it's an array of arrays)
         - Returns an array containing the average price over the last 5 days for each stock. 
             For example, the first element of the resulting array should contain Apple’s (aapl) average stock price for the last 5 days.
             The second element should be Microsoft's (msft) average price, and so on.
-    The average value should be rounded to 2 decimal places, and should be a number (not a string)
+    The average value should be rounded to 2 decimal places, and sh
+    ould be a number (not a string)
 
-    Hint 1: To calculate the average of a set of values, you can add them together and divide by the number of values.
+    Hint 1: To calculate the average of a set of values, you can add them together and
+     divide by the number of values.
         So the average of 5, 10 and 20 is (5 + 10 + 20) / 3 = 11.67
     Hint 2: If the problem seems complex, try breaking it down into smaller problems.
-        Solve the smaller problems, and then build those solutions back up to solve the larger problem.
+        Solve the smaller problems, and then build those solutions back up 
+        to solve the larger problem.
         Functions can help with this!
 */
 function getAveragePrices(closingPricesForAllStocks) {
     // TODO
+    let result = []
+    for (let i = 0; i < closingPricesForAllStocks.length; i++){
+        let companyStock = closingPricesForAllStocks[i];
+        let sum = 0;
+        for (let j = 0; j < companyStock.length; j++){
+            sum = sum + companyStock[j];
+        }
+        result[i] = (sum / companyStock.length).toFixed(2)
+    }
+    return result;
 }
 
 /*
-    We also want to see what the change in price is from the first day to the last day for each stock.
+    We also want to see what the change in price is from the first day 
+    to the last day for each stock.
     Implement the below function, which
-        - Takes this CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS array as input (remember, it's an array of arrays)
+        - Takes this CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS array as 
+        input (remember, it's an array of arrays)
         - Returns an array containing the price change over the last 5 days for each stock.
             For example, the first element of the resulting array should contain Apple’s (aapl) price change for the last 5 days.
             In this example it would be:
                 (Apple's price on the 5th day) - (Apple's price on the 1st day) = 172.99 - 179.19 = -6.2
-    The price change value should be rounded to 2 decimal places, and should be a number (not a string)
+    The price change value should be rounded to 2 decimal places, 
+    and should be a number (not a string)
 */
 function getPriceChanges(closingPricesForAllStocks) {
     // TODO
+    let result = []
+    for (let i = 0; i < closingPricesForAllStocks.length; i++) {
+        let companyStock = closingPricesForAllStocks[i];
+
+        let lastNumber = companyStock.length - 1
+        result[i] = (companyStock[lastNumber] - companyStock[0]).toFixed(2)
+    }
+    return result;
 }
 
 /*
-    As part of a financial report, we want to see what the highest price was for each stock in the last 5 days.
+    As part of a financial report, we want to see what the highest price was
+     for each stock in the last 5 days.
     Implement the below function, which
         - Takes 2 parameters:
             - the CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS array as input (remember, it's an array of arrays)
             - the STOCKS array
         - Returns an array of strings describing what the highest price was for each stock.
-            For example, the first element of the array should be: "The highest price of AAPL in the last 5 days was 180.33"
+            For example, the first element of the array should be: 
+            "The highest price of AAPL in the last 5 days was 180.33"
             The test will check for this exact string.
     The stock ticker should be capitalised.
     The price should be shown with exactly 2 decimal places.
 */
 function highestPriceDescriptions(closingPricesForAllStocks, stocks) {
-    // TODO
+    let result = []
+    for (let i = 0; i < closingPricesForAllStocks.length; i++) {
+        let companyStock = closingPricesForAllStocks[i];
+        let highestValue = companyStock[0];
+        for (let j = 0; j < companyStock.length; j++) {
+            if (companyStock[j] > highestValue) {
+                highestValue = companyStock[j]
+            }          
+        }
+        result[i] = "The highest price of " + stocks[i].toUpperCase() + " in the last 5 days was " + highestValue.toFixed(2)
+    }
+    return result;
 }