London 10 | Shahid Amin | JavaScript-Core-1-Coursework-Week3

1-exercises/A-undefined/exercise.js

@@ -12,7 +12,7 @@
 // Example 1
 let a;
 console.log(a);
-
+// a is not assigned a value
 
 // Example 2
 function sayHello() {
@@ -21,7 +21,7 @@ function sayHello() {
 
 let hello = sayHello();
 console.log(hello);
-
+//There is no value passed to the function sayHello
 
 // Example 3
 function sayHelloToUser(user) {
@@ -30,7 +30,11 @@ function sayHelloToUser(user) {
 
 sayHelloToUser();
 
+//no value passed to the function
+
 
 // Example 4
 let arr = [1,2,3];
 console.log(arr[3]);
+
+//There is no value at index 3

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

@@ -8,6 +8,8 @@
 
 let numbers = [1, 2, 3]; // Don't change this array literal declaration
 
+numbers[3] = numbers.push(4)
+//The first value is 1???
 /* 
   DO NOT EDIT BELOW THIS LINE
   --------------------------- */

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

@@ -26,6 +26,14 @@ const AGES = [
     49
 ];
 
+AGES.forEach(k => {
+    WRITERS.forEach(i => {
+        console.log(i +  " is " + k + " years old")
+    })
+})
+
+
+
 // TODO - Write for loop code here
 
 /*

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

@@ -18,6 +18,12 @@ const BIRTHDAYS = [
 
 function findFirstJulyBDay(birthdays) {
     // TODO
+        for (let dateOfBirth of BIRTHDAYS) {
+        let getMonth = dateOfBirth.split(' ')[0];
+        if (getMonth === "July") {
+            return dateOfBirth;
+        }
+    }
 }
 
 console.log(findFirstJulyBDay(BIRTHDAYS)); // should output "July 11th"

2-mandatory/1-weather-report.js

@@ -12,7 +12,12 @@
 */
 
 function getTemperatureReport(cities) {
-    // TODO
+     let report = [];
+    for (let city of cities) {
+        let temparatureOfCity = temperatureService(city);
+        report.push(`The temperature in ${city} is ${temparatureOfCity} degrees`);
+    }
+    return report;
 }
 
 

2-mandatory/2-financial-times.js

@@ -5,7 +5,12 @@
     Implement the function below, which will return a new array containing only article titles which will fit.
 */
 function potentialHeadlines(allArticleTitles) {
-    // TODO
+  const shortArticleTitles = [];
+    for (let articleTitle of allArticleTitles) {
+        if (articleTitle.length <= 65) {
+            shortArticleTitles.push(articleTitle);
+        }
+    }
 }
 
 /*
@@ -14,7 +19,16 @@ function potentialHeadlines(allArticleTitles) {
     (you can assume words will always be seperated by a space)
 */
 function titleWithFewestWords(allArticleTitles) {
-    // TODO
+    let fewestword = allArticleTitles[0].split(' ').length;
+    let result;
+    for (let articleTitle of allArticleTitles) {
+       let articleWords = articleTitle.split(' ').length;
+       if (articleWords < fewestword ) {
+        fewestword = articleWords;
+        result = articleTitle;
+       }
+    }
+    return result;
 }
 
 /*
@@ -23,7 +37,17 @@ 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 regex = /[0-9]/;
+    let result = [];
+    for (let articleTitle of allArticleTitles) {
+        for (let i = 0; i < articleTitle.length; i++) {
+            if(articleTitle[i].match(regex)){
+                result.push(articleTitle);
+                break;
+            } 
+        }
+    }
+    return result;
 }
 
 /*
@@ -32,6 +56,21 @@ function headlinesWithNumbers(allArticleTitles) {
 */
 function averageNumberOfCharacters(allArticleTitles) {
     // TODO
+
+let arrayOfLengths = allArticleTitles.map(w => w.length);
+console.log(arrayOfLengths)
+let sumOfLengths = 0;
+ for (let i = 0; i < arrayOfLengths.length; i++) {
+         sumOfLengths += arrayOfLengths[i];
+         console.log(sumOfLengths)
+    }
+
+let sumOfArrayLengths = arrayOfLengths.length
+console.log(sumOfArrayLengths)
+
+let result = sumOfLengths/sumOfArrayLengths;
+console.log(result)
+
 }
 
 

2-mandatory/3-stocks.js

@@ -8,6 +8,46 @@
 */
 
 /* ======= Stock data - DO NOT MODIFY ===== */
+
+/* Thinking throught the steps
+
+let keys = STOCKS
+
+let arrayA = CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS[0]
+let arrayM = CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS[1]
+let arrayAZ = CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS[2]
+let arrayG = CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS[3]
+let arrayT = CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS[4]
+
+
+let totalA = arrayA.reduce(function(a,b){ return +a + +b; });
+console.log(totalA)
+
+let totalM = arrayM.reduce(function(a,b){ return +a + +b; });
+console.log(totalM)
+
+let totalAZ = arrayAZ.reduce(function(a,b){ return +a + +b; });
+console.log(totalAZ)
+
+let totalG = arrayG.reduce(function(a,b){ return +a + +b; });
+console.log(totalG)
+
+let totalT = arrayT.reduce(function(a,b){ return +a + +b; });
+console.log(totalT)
+
+
+totalA = Math.round(totalA).toFixed(2)
+totalM = Math.round(totalM).toFixed(2)
+totalAZ = Math.round(totalT).toFixed(2)
+totalG = Math.round(totalG).toFixed(2)
+totalT = Math.round(totalT).toFixed(2)
+
+
+
+let finalArray = [totalA/5, totalM/5, totalAZ/5, totalG/5, totalT/5]
+
+console.log(finalArray)*/
+
 const STOCKS = ["aapl", "msft", "amzn", "googl", "tsla"];
 
 const CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS = [
@@ -18,6 +58,8 @@ const CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS = [
     [1101.30, 1093.94, 1067.00, 1008.87, 938.53] // TSLA
 ];
 
+console.log(CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS [0])
+
 /*
     We want to understand what the average price over the last 5 days for each stock is.
     Implement the below function, which
@@ -35,6 +77,21 @@ const CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS = [
 */
 function getAveragePrices(closingPricesForAllStocks) {
     // TODO
+    let averageprice=[];
+
+   for(const stocksline of closingPricesForAllStocks){
+    let sum = 0;
+    let average = 0;
+    for(const item of stocksline){
+      sum = sum + item;
+
+    }
+      average = sum / stocksline.length;
+      averageprice.push(Math.round(average * 100) / 100);
+
+   }
+return averageprice;
+
 }
 
 /*
@@ -49,6 +106,13 @@ function getAveragePrices(closingPricesForAllStocks) {
 */
 function getPriceChanges(closingPricesForAllStocks) {
     // TODO
+     const priceChange = [];
+    for(const stocksline of closingPricesForAllStocks){
+        let sub = 0;
+         sub = stocksline.slice(-1) - stocksline[0];
+        priceChange.push(Math.round(sub*100)/100);
+    }
+    return priceChange;
 }
 
 /*
@@ -65,6 +129,27 @@ function getPriceChanges(closingPricesForAllStocks) {
 */
 function highestPriceDescriptions(closingPricesForAllStocks, stocks) {
     // TODO
+    const result = [];
+let num = 0;
+let Name;
+for(const stocksline of closingPricesForAllStocks){
+
+
+         let FirstPrice = stocksline[0];
+        let i = 1;
+        while(i<stocksline.length){
+         let price = stocksline[i];
+        if(price>FirstPrice){
+          FirstPrice = price;
+        }
+        i=i+1;
+        }
+
+        Name = stocks[num].toUpperCase();
+        result.push(`The highest price of ${Name} in the last 5 days was ${FirstPrice.toFixed(2)}`);
+        num = num + 1;
+}
+return result;
 }
 
 

3-extra/1-radio-stations.js

@@ -15,6 +15,14 @@
 
 // `getAllFrequencies` goes here
 
+function getAllFrequencies() {
+  const frequencies = [];
+  for (let i = 87; i <= 108; i++) {
+    frequencies.push(i);
+  }
+  return frequencies;
+}
+
 /**
  * Next, let's write a function that gives us only the frequencies that are radio stations.
  * Call this function `getStations`.
@@ -26,6 +34,12 @@
  */
 // `getStations` goes here
 
+function getStations() {
+  const frequencies = getAllFrequencies();
+  const radioStations = frequencies.filter(isRadioStation);
+  return radioStations;
+}
+
 /*
  * ======= TESTS - DO NOT MODIFY =======
  * Note: You are not expected to understand everything below this comment!