London class-10 -Junita Lama-JavaScript-1-week 4

1-exercises/A-array-find/exercise.js

@@ -16,8 +16,11 @@ let names = [
   "Karim",
   "Ahmed",
 ];
+ //function longNameWithA(name) {
+ // return name.length > 7;
+//}
 
-let longNameThatStartsWithA = findLongNameThatStartsWithA(names);
+let longNameThatStartsWithA = names.find(name => name.length > 7);
 
 console.log(longNameThatStartsWithA);
 

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

@@ -11,7 +11,11 @@ let pairsByIndex = [[0, 3], [1, 2], [2, 1], null, [3, 0]];
 // If there is a null value in the array exit the program with the error code
 // https://nodejs.org/api/process.html#process_process_exit_code
 // process.exit(1);
-
+ for (let pair of pairsByIndex){
+  if (!pair){
+    process.exit(1);
+  }
+ }
 let students = ["Islam", "Lesley", "Harun", "Rukmini"];
 let mentors = ["Daniel", "Irina", "Mozafar", "Luke"];
 

1-exercises/C-array-every/exercise.js

@@ -5,7 +5,19 @@
 let students = ["Omar", "Austine", "Dany", "Swathi", "Lesley", "Rukmini"];
 let group = ["Austine", "Dany", "Swathi", "Daniel"];
 
-let groupIsOnlyStudents; // complete this statement
+/*function containsStudent (groupWithStudents){
+  for (let name of groupWithStudents){
+    if(group.includes(students)){
+return true;
+    } else{
+      return false;
+    }
+
+  }
+
+}*/
+
+let groupIsOnlyStudents = students.every(name => group.includes(students)? true : false);
 
 if (groupIsOnlyStudents) {
   console.log("The group contains only students");

1-exercises/D-array-filter/exercise.js

@@ -8,7 +8,18 @@
 
 let pairsByIndexRaw = [[0, 3], [1, 2], [2, 1], null, [1], false, "whoops"];
 
-let pairsByIndex; // Complete this statement
+
+
+
+
+
+let pairsByIndex = pairsByIndexRaw.filter(item => Array.isArray(item) && item.length === 2);
+
+
+
+
+
+
 
 let students = ["Islam", "Lesley", "Harun", "Rukmini"];
 let mentors = ["Daniel", "Irina", "Mozafar", "Luke"];

1-exercises/E-array-map/exercise.js

@@ -3,9 +3,19 @@
 
 let numbers = [0.1, 0.2, 0.3, 0.4, 0.5];
 
-let numbersMultipliedByOneHundred; // complete this statement
+/*let numbersMultipliedByOneHundred = numbers.map(function multiply(number) {
+ // return number * 100;
+//});
+let numbersMultipliedByOneHundred = numbers.map(function(number){
+  return number * 100;
+}) 
+let numbersMultipliedByOneHundred = numbers.map(number =>{
 
+  return number *100;
+})*/
+let numbersMultipliedByOneHundred = numbers.map(number => number *100);
 console.log(numbersMultipliedByOneHundred);
+
 
 /* EXPECTED RESULT
 

1-exercises/F-array-forEach/exercise.js

@@ -8,6 +8,25 @@
 */
 
 let arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15];
+arr.forEach(n => {
+  if(n % 3 === 0 && n % 5 === 0){
+  console.log("FizzBuzz");}
+    else if(n % 3 === 0){
+      console.log("Fizz");}
+   else if(n % 5 === 0){
+    console.log("Buzz");}
+    else{
+      console.log(n);
+    }
+
+
+
+}
+);
+
+
+
+
 
 /* EXPECTED OUTPUT */
 

1-exercises/G-array-methods/exercise.js

@@ -4,7 +4,7 @@
 */
 
 let numbers = [3, 2, 1];
-let sortedNumbers; // complete this statement
+let sortedNumbers = numbers.sort(); // complete this statement
 
 /* 
   DO NOT EDIT BELOW THIS LINE

1-exercises/G-array-methods/exercise2.js

@@ -7,7 +7,7 @@
 let mentors = ["Daniel", "Irina", "Rares"];
 let students = ["Rukmini", "Abdul", "Austine", "Swathi"];
 
-let everyone; // complete this statement
+let everyone = mentors.concat(students); // complete this statement
 
 /* 
   DO NOT EDIT BELOW THIS LINE

1-exercises/H-array-methods-2/exercise.js

@@ -15,8 +15,8 @@ let everyone = [
   "Swathi",
 ];
 
-let firstFive; // complete this statement
-let lastFive; // complete this statement
+let firstFive = everyone.slice(0, 5); // complete this statement
+let lastFive = everyone.slice(2, 7); // complete this statement
 
 /* 
   DO NOT EDIT BELOW THIS LINE

1-exercises/H-array-methods-2/exercise2.js

@@ -7,7 +7,12 @@
   Tip: use the string method .split() and the array method .join()
 */
 
-function capitalise(str) {}
+function capitalise(str) {
+ let character = str.split("");
+  character[0] = character[0].toUpperCase();
+  return character.join("");
+}
+
 
 /* 
   DO NOT EDIT BELOW THIS LINE

1-exercises/H-array-methods-2/exercise3.js

@@ -7,7 +7,7 @@
 let ukNations = ["Scotland", "Wales", "England", "Northern Ireland"];
 
 function isInUK(country) {
-  return; // complete this statement
+  return ukNations.includes(country); // complete this statement
 }
 
 /* 

1-exercises/I-string-replace/exercise.js

@@ -13,7 +13,7 @@
 let story =
   "I like dogs. One day I went to the park and I saw 10 dogs. It was a great day.";
 
-let result = story.replace("", "");
+let result = story.replace("dogs", "cats") .replace("day","night") .replace("10","10000") .replace("great","brilliant") .replace("day","night");
 
 /* EXPECTED OUTPUT */
 

1-exercises/J-string-substring/exercise.js

@@ -6,7 +6,7 @@
 
 let statement = "I like programming and dogs";
 
-statement = statement.substring();
+statement = statement.substring(7,statement.length);
 
 console.log(statement);
 

1-exercises/J-string-substring/exercise2.js

@@ -14,11 +14,11 @@ let names = [
   "Arron Graham",
 ];
 
-names[0] = names[0].substring();
-names[1] = names[1].substring();
-names[2] = names[2].substring();
-names[3] = names[3].substring();
-names[4] = names[4].substring();
+names[0] = names[0].substring(0,6);
+names[1] = names[1].substring(0,7);
+names[2] = names[2].substring(0,4);
+names[3] = names[3].substring(0,4);
+names[4] = names[4].substring(0,5);
 
 names.forEach((name) => {
   console.log(name);

1-exercises/J-string-substring/exercise3.js

@@ -6,10 +6,7 @@
   HINT: You will need to use .substring() twice
 */
 
-let statement = "I do not like programming";
-
-let result = "";
-
+let statement = "I do not like programming"
 console.log(result);
 
 /* EXPECTED OUTPUT 

2-mandatory/1-create-functions.js

@@ -3,15 +3,18 @@ Write a function that:
 - Accepts an array as a parameter.
 - Returns a new array containing the first five elements of the passed array.
 */
-function first5() {
-}
+function first5(arr) {
+  let newArr =arr.slice(0,5);
+  return newArr;}
+
 
 /*
 Write a function that:
 - Accepts an array as a parameter.
 - Returns a new array containing the same elements, except sorted.
 */
-function sortArray() {
+function sortArray(arr) {
+  return arr.slice().sort();
 }
 
 /*
@@ -24,7 +27,14 @@ Write a function that:
 - Removes any forward slashes (/) in the strings.
 - Makes the strings all lowercase.
 */
-function tidyUpString() {
+function tidyUpString(arr) {
+  newArr = arr.map(function (string) {
+    string = string.trim();
+    string = string.replace("/", "");
+    string = string.toLowerCase();
+    return string;
+  });
+  return newArr;
 }
 
 /*
@@ -33,7 +43,10 @@ Write a function that:
 - Returns a new array containing the same elements, but without the element at the passed index.
 */
 
-function remove() {
+function remove(array,index) {
+  let arr =array.slice();
+  arr.splice(index,1);
+  return arr;
 }
 
 /*
@@ -44,7 +57,17 @@ Write a function that:
 - Numbers greater 100 must be replaced with 100.
 */
 
-function formatPercentage() {
+function formatPercentage(numbers) {
+  let newnumbers = numbers.map(function (number) {
+    if (number > 100) {
+      number = "100%";
+    } else {
+      number = `${Math.round(number * 100) / 100}%`;
+    }
+
+    return number;
+  });
+  return newnumbers;
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */

2-mandatory/2-oxygen-levels.js

@@ -11,7 +11,17 @@
     Some string methods that might help you here are .replace() and .substring().
 */
 
-function findSafeOxygenLevel() {}
+function findSafeOxygenLevel(oxygenLevels) {
+let planets=oxygenLevels.filter(oxygenLevel =>oxygenLevel.includes("%"))
+let numberLevels= planets.map(number => parseFloat(number))
+let safePlanets=numberLevels.find(level => level> 19.5 && level<23.5)
+if(safePlanets!==undefined){
+  return `${safePlanets}%`;
+}
+
+}
+
+
 
 /* ======= TESTS - DO NOT MODIFY ===== */
 

2-mandatory/3-bush-berries.js

@@ -21,8 +21,14 @@
   Let's first look at an example that will teach you how to use these methods.
 */
 
-function isBushSafe(berryArray) {
-  //Write your code here
+function isBushSafe(berryArray) { 
+  let safeBush = berryArray.every(berry => berry.includes("pink"))
+  if(safeBush){
+    return "Bush is safe to eat from"
+  }else{
+    return  "Toxic! Leave bush alone!"
+
+  }
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */

2-mandatory/4-space-colonies.js

@@ -15,7 +15,10 @@
 
 */
 
-function getSettlers() {}
+function getSettlers(families) {
+  let family = families.filter(word=>word.startsWith("A") && word.endsWith("family"))
+  return family;
+}
 
 /* ======= TESTS - DO NOT MODIFY ===== */
 

2-mandatory/5-eligible-students.js

@@ -7,7 +7,10 @@
   - Returns an array containing only the names of the who have attended AT LEAST 8 classes
 */
 
-function getEligibleStudents() {}
+function getEligibleStudents(students, attendance) {
+  let studentName = students.filter(attendance=>attendance[1]>=8)
+  return studentName.map(names=>names[0]);
+}
 
 /* ======= TESTS - DO NOT MODIFY ===== */