London Class 10 - Andrius Isin - JS1 - Week 4

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

@@ -16,8 +16,13 @@ let names = [
   "Karim",
   "Ahmed",
 ];
-
-let longNameThatStartsWithA = findLongNameThatStartsWithA(names);
+function getlongNameThatStartsWithA(name) {
+  return name > 7 && name.startsWith("A");
+}
+let longNameThatStartsWithA = names.find(getlongNameThatStartsWithA);
+// let longNameThatStartsWithA = names.find((element) => {
+//   return element.length > 7 && element.startsWith("A");
+// });
 
 console.log(longNameThatStartsWithA);
 

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

@@ -16,9 +16,13 @@ let students = ["Islam", "Lesley", "Harun", "Rukmini"];
 let mentors = ["Daniel", "Irina", "Mozafar", "Luke"];
 
 let pairs = pairsByIndex.map(function (indexes) {
-  let student = students[indexes[0]];
-  let mentor = mentors[indexes[1]];
-  return [student, mentor];
+  if (indexes !== null) {
+    let student = students[indexes[0]];
+    let mentor = mentors[indexes[1]];
+    return [student, mentor];
+  } else {
+    process.exit([1]);
+  }
 });
 
 console.log(pairs);

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

@@ -3,9 +3,9 @@
 */
 
 let students = ["Omar", "Austine", "Dany", "Swathi", "Lesley", "Rukmini"];
-let group = ["Austine", "Dany", "Swathi", "Daniel"];
+let group = ["Austine", "Dany", "Swathi"];
 
-let groupIsOnlyStudents; // complete this statement
+let groupIsOnlyStudents = group.every((element) => students.includes(element));
 
 if (groupIsOnlyStudents) {
   console.log("The group contains only students");

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

@@ -8,7 +8,9 @@
 
 let pairsByIndexRaw = [[0, 3], [1, 2], [2, 1], null, [1], false, "whoops"];
 
-let pairsByIndex; // Complete this statement
+let pairsByIndex = pairsByIndexRaw.filter((element) => {
+  return Array.isArray(element) && element.length === 2;
+});
 
 let students = ["Islam", "Lesley", "Harun", "Rukmini"];
 let mentors = ["Daniel", "Irina", "Mozafar", "Luke"];
@@ -24,4 +26,4 @@ console.log(pairs);
 /* EXPECTED RESULT
 
   [ [ 'Islam', 'Luke' ], [ 'Lesley', 'Mozafar' ], [ 'Harun', 'Irina' ] ]
-*/
+*/

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

@@ -3,11 +3,11 @@
 
 let numbers = [0.1, 0.2, 0.3, 0.4, 0.5];
 
-let numbersMultipliedByOneHundred; // complete this statement
+let numbersMultipliedByOneHundred = numbers.map((num) => num * 100);
 
 console.log(numbersMultipliedByOneHundred);
 
 /* EXPECTED RESULT
 
   [10, 20, 30, 40, 50]
-*/
+*/

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

@@ -8,7 +8,15 @@
 */
 
 let arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15];
-
+let newArray = arr.forEach((number) => {
+  if (number % 3 === 0) {
+    console.log("Fizz");
+  } else if (number % 5 === 0) {
+    console.log("Buzz");
+  } else {
+    console.log(number);
+  }
+});
 /* 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();
 
 /* 
   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);
 
 /* 
   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);
+let lastFive = everyone.slice(-5);
 
 /* 
   DO NOT EDIT BELOW THIS LINE

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

@@ -7,7 +7,11 @@
   Tip: use the string method .split() and the array method .join()
 */
 
-function capitalise(str) {}
+function capitalise(str) {
+  let arr = str.split("");
+  arr[0] = arr[0].toUpperCase();
+  return arr.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);
 }
 
 /* 

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

@@ -13,7 +13,12 @@
 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/g, "cats")
+  .replace(/day/g, "night")
+  .replace(/great/g, "brilliant")
+  .replace(/10/g, "100000");
+console.log(result);
 
 /* 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(0, 19);
 
 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

@@ -8,7 +8,10 @@
 
 let statement = "I do not like programming";
 
-let result = "";
+let result = `${statement.substring(0, 4)}${statement.substring(
+  8,
+  statement.length
+)}`;
 
 console.log(result);
 

2-mandatory/1-create-functions.js

@@ -2,29 +2,34 @@
 Write a function that:
 - Accepts an array as a parameter.
 - Returns a new array containing the first five elements of the passed array.
+npm test -- --testPathPattern 1-create-functions.js
 */
-function first5() {
+function first5(array) {
+  return array.slice(0, 5);
 }
 
 /*
 Write a function that:
 - Accepts an array as a parameter.
 - Returns a new array containing the same elements, except sorted.
 */
-function sortArray() {
+function sortArray(array) {
+  return array.slice().sort();
 }
 
 /*
-NOTE: This exercise is the same as one you did last week - try to do it again using things you learnt this week.
-Think about what is better about this solution than your one last week, and what is worse.
+NOTE: This exercise is the same as one you did last week - try to do it again using things 
+you learnt this week. Think about what is better about this solution than your one last
+ week, and what is worse.
 
 Write a function that:
 - Takes an array of strings as input.
 - Removes any spaces in the beginning or end each string.
 - Removes any forward slashes (/) in the strings.
 - Makes the strings all lowercase.
 */
-function tidyUpString() {
+function tidyUpString(array) {
+  return array.map((string) => string.trim().replace("/", "").toLowerCase());
 }
 
 /*
@@ -33,7 +38,8 @@ 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) {
+  return array.filter((element, i) => i !== index);
 }
 
 /*
@@ -44,7 +50,13 @@ Write a function that:
 - Numbers greater 100 must be replaced with 100.
 */
 
-function formatPercentage() {
+function formatPercentage(numbers) {
+  return numbers.map((number) => {
+    if (number > 100) {
+      number = 100;
+    }
+    return `${Math.round(number * 100) / 100}%`;
+  });
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */

2-mandatory/2-oxygen-levels.js

@@ -11,8 +11,17 @@
     Some string methods that might help you here are .replace() and .substring().
 */
 
-function findSafeOxygenLevel() {}
-
+function findSafeOxygenLevel(oxygen) {
+  let firstSafePlanet = oxygen
+    .filter((planet) => planet.includes("%"))
+    .map((planet) => Number(planet.replace("%", "")))
+    .find((planet) => planet > 19.5 && planet < 23.5);
+  if (firstSafePlanet === undefined) {
+    return firstSafePlanet;
+  } else {
+    return firstSafePlanet + "%";
+  }
+}
 /* ======= TESTS - DO NOT MODIFY ===== */
 
 test("findSafeOxygenLevel function works - case 1", () => {

2-mandatory/3-bush-berries.js

@@ -22,7 +22,12 @@
 */
 
 function isBushSafe(berryArray) {
-  //Write your code here
+  let safeToEat = berryArray.every((color) => color === "pink");
+  if (safeToEat) {
+    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 +15,11 @@
 
 */
 
-function getSettlers() {}
+function getSettlers(voyagers) {
+  return voyagers.filter(
+    (family) => family.startsWith("A") && family.includes("family")
+  );
+}
 
 /* ======= TESTS - DO NOT MODIFY ===== */
 

2-mandatory/5-eligible-students.js

@@ -7,7 +7,11 @@
   - Returns an array containing only the names of the who have attended AT LEAST 8 classes
 */
 
-function getEligibleStudents() {}
+function getEligibleStudents(students) {
+  return students
+    .filter((student) => student[1] >= 8)
+    .map((student) => student[0]);
+}
 
 /* ======= TESTS - DO NOT MODIFY ===== */
 

2-mandatory/6-journey-planner.js

@@ -20,8 +20,8 @@
 function checkCodeIsThere(stringText) {
   let magicWord = "code";
   //edit code below
-  if (stringText) {
-    return stringText;
+  if (stringText.includes(magicWord)) {
+    return stringText.indexOf(magicWord);
   } else {
     return "Not found";
   }
@@ -64,7 +64,9 @@ function checkCodeIsThere(stringText) {
 
   Hint: Use the corresponding array method to split the array.
 */
-function getTransportModes() {}
+function getTransportModes(array) {
+  return array.slice(1);
+}
 
 /*
   Implement the function isAccessibleByTransportMode that
@@ -81,7 +83,9 @@ function getTransportModes() {}
 
   Hint: Use the corresponding array method to decide if an element is included in an array.
 */
-function isAccessibleByTransportMode() {}
+function isAccessibleByTransportMode(modes, transportMode) {
+  return modes.includes(transportMode);
+}
 
 /*
   Implement the function getLocationName that
@@ -92,7 +96,9 @@ function isAccessibleByTransportMode() {}
    - Returns the name of the location
       e.g: "Tower Bridge"
 */
-function getLocationName() {}
+function getLocationName(locationAndTransports) {
+  return locationAndTransports[0];
+}
 
 /*
  We arrived at the final method. it won't take long if you use the previously implemented functions wisely.
@@ -122,7 +128,9 @@ function getLocationName() {}
   Advanced challange: try to use arrow function when invoking an array method.
 */
 function journeyPlanner(locations, transportMode) {
-  // Implement the function body
+  return locations
+    .filter((location) => location.includes(transportMode))
+    .map((location) => location[0]);
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */

2-mandatory/7-lane-names.js

@@ -6,7 +6,9 @@
   HINT: string and array methods that could be helpful (indexOf, filter)
 */
 
-function getLanes() {}
+function getLanes(streetNames) {
+  return streetNames.filter((street) => street.indexOf("Lane") > 0);
+}
 
 /* ======= TESTS - DO NOT MODIFY ===== */