CodeYourFuture · laxmikckarki · Dec 7, 2022 · Dec 7, 2022 · Dec 11, 2022
diff --git a/1-exercises/A-undefined/demo.js b/1-exercises/A-undefined/demo.js
@@ -0,0 +1,116 @@
+function double(n) {
+    return n * 2;
+}
+console.log(double(3)); 
+console.log(double(5));
+
+
+function doubleEachElement(arr) {
+    let newArr = [];
+    for(let element of arr) {
+        let newValue = double(element);
+        newArr.push(newValue);
+    }
+    return newArr;    
+}
+
+
+function triple(n) {
+    return n * 3;
+}
+console.log(double(3)); 
+console.log(double(5));
+
+function tripleEachElement(arr) {
+    let newArr = [];
+    for(let element of arr) {
+        let newValue = triple(element);
+        newArr.push(newValue);
+    }
+    return newArr;    
+}
+
+
+function update(arr, func) {
+    let newArr = [];
+    for(let element of arr) {
+        let newValue = func(element);
+        newArr.push(newValue);
+    }
+    return newArr;    
+}
+let arr =[2, 3, 4];
+let doublesValues = update(arr, double);
+let tripleValues = update(arr, triple);
+console.log(doublesValues);
+console.log(tripleValues);
+
+function double(n) {
+    return n * 2;
+}
+update(arr, double);
+
+function hello(teamMember) {
+    console.log("Hello " + teamMember);
+}
+function notifyPeople(team) {
+    for(teamMember of team) {
+        hello(teamMember);
+    }
+}
+
+notifyPeople(arr, hello)
+
+
+function goodBye(teamMember) {
+    console.log('Goodbye ' + teamMember);
+}
+    function notifyPeople(team, func ){
+        for(teamMember of team) {
+           func(teamMember);
+
+        }
+    }
+
+notifyPeople(arr, goodBye);
+
+
+let shoppingList = ['bananas', 'milk', 'bread'];
+shoppingList.forEach(value => {
+    console.log(`We need to buy ${value}`);
+});
+
+let data = [1, 2, 3, 4, 5];
+let newArr = data.map(value =>  value * 2); 
+
+
+console.log(newArr);
+console.log(data);
+
+
+let data1 = [1, 2, 3, 4, 5];
+let evenNumbers = data.filter(value => {
+    return value % 2 === 0});
+console.log(evenNumbers);
+console.log(data1);
+
+let data2 = [1, 2, 3, 4, 5];
+let firstEvenNumber = data.find(value => value % 2 === 0);
+console.log(firstEvenNumber); 
+
+let data3 = [1, 2, 3, 4, 5];
+data
+    .filter(value => value % 2 === 0)
+    .map(value => value * 3)
+    .forEach(value => console.log(value));
+
+
+
+    let channels = ["bbc1", "BBC2", "ITV", "channel4", 
+"Channel5", "bbc3", "bbc4", "itv2", "ITV3", "itv4"];
+console.log(channels);
+
+channels.map(channel => channel.toUpperCase)
+let newChannel = channels.map(item => item.toUpperCase());
+let itvChannel = newChannel.filter(item => item.includes('ITV'))
+newChannel.forEach(item => console.log(item));
diff --git a/1-exercises/A-undefined/exercise.js b/1-exercises/A-undefined/exercise.js
@@ -1,36 +1,192 @@
-/*
-    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.
+// /*
+//     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.
-    But usually, when you see undefined - it means something has gone wrong!
+//     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.
-    For each example, can you explain why we are seeing undefined?
-*/
+//     Below are 4 typical examples of when you would see undefined.
+//     For each example, can you explain why we are seeing undefined?
+// */
 
-// Example 1
-let a;
-console.log(a);
+// // Example 1
+// let a;
+// console.log(a);
+// //does not have assigned value//
 
 
-// Example 2
-function sayHello() {
-    let message = "Hello";
+// // Example 2
+// function sayHello() {
+//     let message = "Hello";
+// }
+
+// let hello = sayHello();
+// console.log(hello);
+// //a value was not returned//
+
+// // Example 3
+// function sayHelloToUser(user) {
+//     console.log(`Hello ${user}`);
+// }
+
+// sayHelloToUser();
+// //there is no any parameter when sayHelloToUser() is called//
+
+// // Example 4
+// let arr = [1,2,3];
+// console.log(arr[3]);
+// //there is no value in arr[3]//
+
+
+
+// let i = 0;
+// while (i < 3) {
+//     console.log(i);
+           // i++
+// }
+
+function sumTo(n) {
+    let sum = 0;
+    let i = 0;
+ while(i <= n) {
+    sum = sum + i;
+    i = i + 1;
+ }   
+ return sum;
+
+}
+console.log(sumTo(3));
+
+
+function showStocks(stocks){
+    if(stocks.lengths === 0) {
+        console.log("Empty Portfolio");
+    } else {
+    let i = 1;
+while (i <= stocks.length) {
+    console.log(stocks[i - 1]);
+    i++;
+}
+}
+}
+let stocks = ["aapl","msft","amzn","googl", 
+"tsla"]
+showStocks(stocks);
+
+
+for(let i = 0; i < 3; i++) {
+    console.log(i);
 }
 
-let hello = sayHello();
-console.log(hello);
 
 
-// Example 3
-function sayHelloToUser(user) {
-    console.log(`Hello ${user}`);
+function sumTo(n) {
+    let sum = 0;
+ for( let i = 0; i <= n; i = i + 1) {
+    sum = sum + i;
+
+ }   
+ return sum;
+
+}
+function showStocks(stocks){
+    if(stocks.lengths === 0) {
+        console.log("Empty Portfolio");
+    } else {
+for(let i = 0; i < stocks.length; i++) {
+    console.log(stocks[i]);
+
 }
+}
+}
+stocks = ["aapl","msft","amzn","googl", 
+"tsla"]
+showStocks(stocks);
+
 
-sayHelloToUser();
+let colours = ["red", "green", "blue"];
 
+ for(let i = 0; i < colours.length; i++) {
+    let colour = colours[i];
+    console.log(colour);
+ }
+
+
+ let colors = ["red", "green", "blue"];
+for(let color of colors) {
+    console.log(color);
+}
 
-// Example 4
-let arr = [1,2,3];
-console.log(arr[3]);
+let phrase = "CodeYourFuture";
+for(let letter of phrase) {
+    console.log(letter);
+}
+
+
+function calculatechanges(prices) {
+    let change = prices[prices.length - 1] - prices[0];
+    return change.toFixed(2);
+}
+function changeInPrices(closingPrices){
+    let changes = [];
+
+   for(let pricesForOneStock of closingPrices) {
+    let change = calculatechanges(pricesForOneStock);
+   changes.push(change);
+}
+return changes;
+}
+
+const closingPricesLast5Days = [
+  [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
+];
+let result = changeInPrices(closingPricesLast5Days);
+console.log(result);
+
+
+let fruits = ["orange", "apple", "banana"];
+fruits.splice(1, 2, "pear");
+console.log(fruits);  
+console.log(fruits.length)
+
+
+ let todo = ["order dog food", "do the dishes"];
+ todo.splice(1, 1, 'take out garbage');
+
+console.log(fruits);
+
+console.log(["orange", "apple", "banana"].sort());
+
+
+let array = [1, 2, 3];
+let firstNewArr = array.concat(4, 5, 6);
+let secondNewArr = array.concat([4, 5, 6]);
+console.log(firstNewArr);
+console.log(secondNewArr);
+console.log(array);
+
+
+let arr = [1, 2, 3, 4, 5];
+console.log(arr.slice(0, 3));  
+console.log(arr.slice(3));  
+console.log(arr.slice(1, -1));  
+console.log(arr);  
+
+let arra = [1, 3, 5];
+console.log(arra.includes(2));
+console.log(arra.includes(3));
+
+let arry = ["orange", "apple", "banana"];
+console.log(arry.join());
+console.log(arry.join(' - '));
+
+let names = ['khadija', 'tom'];
+console.log(names.join());
+
+function namesInArray(names) {
+
+}
diff --git a/1-exercises/B-while-loop/exercise.js b/1-exercises/B-while-loop/exercise.js
@@ -1,12 +1,20 @@
 /*
-    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 result = [];
+  let i = 0;
+  while (i < n ) {
+    result.push(i * 2);
+    i++;
+  }
+  console.log(result.join());
 }
 
 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
@@ -17,7 +17,15 @@ const BIRTHDAYS = [
 ];
 
 function findFirstJulyBDay(birthdays) {
-    // TODO
+    let currentIndex = 0;
+while (currentIndex < birthdays.length) {
+if (birthdays[currentIndex].includes('July')) {
+
+     return birthdays[currentIndex];
+
+   }
+   currentIndex++;
 }
 
+}
 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
@@ -7,8 +7,18 @@
 */
 
 function evenNumbersSum(n) {
-    // 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