Glasgow Class 6 - Diana Savchuk - JS-1 - Week 3

1-exercises/A-undefined/exercise.js

@@ -11,7 +11,7 @@
 
 // Example 1
 let a;
-console.log(a);
+console.log(a); //value is not asigned
 
 
 // Example 2
@@ -20,17 +20,17 @@ function sayHello() {
 }
 
 let hello = sayHello();
-console.log(hello);
+console.log(hello); //sayHello() function does not have a return statement
 
 
 // Example 3
 function sayHelloToUser(user) {
     console.log(`Hello ${user}`);
 }
 
-sayHelloToUser();
+sayHelloToUser(); //sayHelloToUser() function is not given a value when the function is called
 
 
 // Example 4
 let arr = [1,2,3];
-console.log(arr[3]);
+console.log(arr[3]); //array contains only 3 elements and indices like 0,1,2 when we write arr[3] it means that we whant to reach the element number 4 which does not exist here.

1-exercises/B-array-literals/exercise.js

@@ -4,8 +4,8 @@
   Declare some variables assigned to arrays of values
 */
 
-let numbers = []; // add numbers from 1 to 10 into this array
-let mentors; // Create an array with the names of the mentors: Daniel, Irina and Rares
+let numbers = [1,2,3,4,5,6,7,8,9,10]; // add numbers from 1 to 10 into this array
+let mentors = ['Daniel', 'Irina', 'Rares']; // Create an array with the names of the mentors: Daniel, Irina and Rares
 
 /* 
   DO NOT EDIT BELOW THIS LINE

1-exercises/C-array-get-set/exercise.js

@@ -5,11 +5,11 @@
 */
 
 function first(arr) {
-  return; // complete this statement
+  return arr[0]; // complete this statement
 }
 
 function last(arr) {
-  return; // complete this statement
+  return arr[arr.length - 1 ]; // complete this statement
 }
 
 /* 

1-exercises/C-array-get-set/exercises2.js

@@ -7,7 +7,8 @@
 */
 
 let numbers = [1, 2, 3]; // Don't change this array literal declaration
-
+numbers.push(4);
+numbers[0] = 1;
 /* 
   DO NOT EDIT BELOW THIS LINE
   --------------------------- */

1-exercises/D-for-loop/exercise.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:
 

1-exercises/E-while-loop-with-array/exercise.js

@@ -18,6 +18,14 @@ const BIRTHDAYS = [
 
 function findFirstJulyBDay(birthdays) {
     // TODO
+    let i = 0;
+    while (i < BIRTHDAYS.length){
+        if(BIRTHDAYS[i].includes("July")){
+            return BIRTHDAYS[i];
+        }
+        i++;
+    }
+
 }
 
 console.log(findFirstJulyBDay(BIRTHDAYS)); // should output "July 11th"

2-mandatory/1-weather-report.js

@@ -13,6 +13,14 @@
 
 function getTemperatureReport(cities) {
     // TODO
+    let forecast = [];
+    for(let i = 0; i < cities.length; i++){
+        const currentCity = cities[i]
+        const temperature = temperatureService(cities[i]);
+        const report = `The temperature in ${currentCity} is ${temperature} degrees`;
+        forecast.push(report);
+    }
+    return forecast;
 }
 
 

2-mandatory/2-financial-times.js

@@ -5,7 +5,13 @@
     Implement the function below, which will return a new array containing only article titles which will fit.
 */
 function potentialHeadlines(allArticleTitles) {
-    // TODO
+    const titles = [];
+    for(let i = 0; i < allArticleTitles.length; i++){
+        if(allArticleTitles[i].length <= 65){
+            titles.push(allArticleTitles[i])
+        }
+    }
+     return titles;
 }
 
 /*
@@ -14,7 +20,15 @@ function potentialHeadlines(allArticleTitles) {
     (you can assume words will always be seperated by a space)
 */
 function titleWithFewestWords(allArticleTitles) {
-    // TODO
+ let  fewestSoFar= allArticleTitles[0];
+
+    for( let i = 0; i < allArticleTitles.length; i++){
+        const currentTitle = allArticleTitles[i];
+        if(currentTitle.split(' ').length < fewestSoFar.split(' ').length){
+            fewestSoFar = currentTitle;
+        }
+    }
+    return fewestSoFar;
 }
 
 /*
@@ -23,15 +37,28 @@ function titleWithFewestWords(allArticleTitles) {
     (Hint: remember that you can also loop through the characters of a string if you need to)
 */
 function headlinesWithNumbers(allArticleTitles) {
-    // TODO
+    const articleWithNumbers = [];
+    for(let i = 0; i < allArticleTitles.length; i++){
+        for(let j = 0; j < allArticleTitles[i].length; j++){
+            if(Number(allArticleTitles[i][j])){
+                articleWithNumbers.push(allArticleTitles[i]);
+                break;
+            }
+        }
+    }
+    return articleWithNumbers;
 }
 
 /*
     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 totalNumbers = 0;
+    for (let i = 0; i < allArticleTitles.length; i++){
+        totalNumbers +=  allArticleTitles[i].length;
+    }
+    return Math.round(totalNumbers/allArticleTitles.length);
 }
 
 

2-mandatory/3-stocks.js

@@ -33,10 +33,20 @@ const CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS = [
         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
+    const averagePrice = closingPricesForAllStocks.map(calculateAverage);
+    return averagePrice;
 }
 
+function calculateAverage(companyStocks){  //callback function
+     let sum = 0;
+    for (let j = 0; j < companyStocks.length; j++) {
+      sum += companyStocks[j];
+    }
+    const average = sum / companyStocks.length;
+    return Number(average.toFixed(2));
+}
 /*
     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
@@ -46,11 +56,32 @@ function getAveragePrices(closingPricesForAllStocks) {
             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)
-*/
+// */
+// function getPriceChanges(closingPricesForAllStocks) {
+//     const priceChanges = [];
+
+//     for (let i = 0; i < closingPricesForAllStocks.length; i++) {
+
+//         const prices = closingPricesForAllStocks[i];
+//         const priceChange = prices[prices.length - 1] - prices[0];
+//         priceChanges.push(Number(priceChange.toFixed(2)));
+//     }
+
+//     return priceChanges;
+// }
+
 function getPriceChanges(closingPricesForAllStocks) {
-    // TODO
+    const priceChanges = closingPricesForAllStocks.map(calculatePriceChange);
+    return priceChanges;
 }
-
+function calculatePriceChange(companyStocks){   
+    for (let i = 0; i < companyStocks.length; i++) {
+        const priceChange = companyStocks[companyStocks.length - 1] - companyStocks[0];
+        return Number(priceChange.toFixed(2));
+    }
+}
+
+
 /*
     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
@@ -64,7 +95,25 @@ function getPriceChanges(closingPricesForAllStocks) {
     The price should be shown with exactly 2 decimal places.
 */
 function highestPriceDescriptions(closingPricesForAllStocks, stocks) {
-    // TODO
+    const descriptions = [];
+
+    for (let i = 0; i < stocks.length; i++) {
+        const stockName = stocks[i].toUpperCase();
+        let highestPrice = 0;
+
+        for (let j = 0; j < 5; j++) {
+        const price = closingPricesForAllStocks[i][closingPricesForAllStocks[i].length - 1 - j];
+
+        if (price > highestPrice) {
+            highestPrice = price;
+        }
+        }
+
+        const description = `The highest price of ${stockName} in the last 5 days was ${highestPrice}`;
+        descriptions.push(description);
+    }
+
+    return descriptions;
 }
 
 
@@ -88,7 +137,7 @@ test("should return a description of the highest price for each stock", () => {
             "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"
+            "The highest price of TSLA in the last 5 days was 1101.3"
         ]
     );
 });