London 9 Turing - Zahraa Tayyar - JavaScript 1 - Week 4

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

@@ -3,7 +3,10 @@
   Using .find(), we'd like to find the first name which starts with A and is longer than 7 letters.
 */
 
-// write your code here
+function findLongNameThatStartsWithA(name) {
+  return name.find(name => name.length > 7 && name[0] === "A")
+}
+
 
 let names = [
   "Rakesh",

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

@@ -8,6 +8,15 @@
 
 let pairsByIndex = [[0, 3], [1, 2], [2, 1], null, [3, 0]];
 
+//answer:
+function isNull(n) {
+  return n === null;
+}
+
+let containsNull = pairsByIndex.some(isNull);
+
+console.log(containsNull);
+
 // 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);

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

@@ -5,7 +5,7 @@
 let students = ["Omar", "Austine", "Dany", "Swathi", "Lesley", "Rukmini"];
 let group = ["Austine", "Dany", "Swathi", "Daniel"];
 
-let groupIsOnlyStudents; // complete this statement
+let groupIsOnlyStudents = group.every((member) => students); // complete this statement
 
 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(
+  (el) => Array.isArray(el) && el.length === 2
+); // Complete this statement
 
 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((number) => number * 100); // complete this statement
 
 console.log(numbersMultipliedByOneHundred);
 
 /* EXPECTED RESULT
 
   [10, 20, 30, 40, 50]
-*/
+*/

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

@@ -9,6 +9,18 @@
 
 let arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15];
 
+let newArr = arr.forEach((n) => {
+  if (n % 3 === 0 && n % 5 === 0) {
+    console.log("FizzBuzz");
+  } else if (n % 5 === 0) {
+    console.log("Buzz");
+  } else if (n % 3 === 0) {
+    console.log("Fizz");
+  } 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((a, b) => (a - b)); // 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(everyone.length - 5); // complete this statement
 
 /* 
   DO NOT EDIT BELOW THIS LINE

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

@@ -7,7 +7,9 @@
   Tip: use the string method .split() and the array method .join()
 */
 
-function capitalise(str) {}
+function capitalise(str) {
+  return str.charAt(0).toUpperCase() + str.slice(1);
+}
 
 /* 
   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 +13,11 @@
 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", "night")
+  .replace(10, 100000)
+  .replace("great day", "brilliant 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(0, 18);
 
 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 +8,8 @@
 
 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

@@ -3,15 +3,17 @@ 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) {
+  return arr.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(arr) {
+  return arr.sort();
 }
 
 /*
@@ -24,7 +26,8 @@ Write a function that:
 - Removes any forward slashes (/) in the strings.
 - Makes the strings all lowercase.
 */
-function tidyUpString() {
+function tidyUpString(arr) {
+  return arr.map((str) => str.trim().replace("/", "").toLowerCase());
 }
 
 /*
@@ -33,7 +36,8 @@ Write a function that:
 - Returns a new array containing the same elements, but without the element at the passed index.
 */
 
-function remove() {
+function remove(arr4, index) {
+  return arr4.replace(/index/g, "");
 }
 
 /*
@@ -44,7 +48,14 @@ Write a function that:
 - Numbers greater 100 must be replaced with 100.
 */
 
-function formatPercentage() {
+function formatPercentage(arr) {
+  return arr.map((i) => {
+    if (i > 100) {
+      console.log("100%");
+    } else {
+      console.log(arr.map((str) => `${str.toFixed(2)}%`));
+    }
+  });
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */

2-mandatory/2-oxygen-levels.js

@@ -11,7 +11,13 @@
     Some string methods that might help you here are .replace() and .substring().
 */
 
-function findSafeOxygenLevel() {}
+function findSafeOxygenLevel(planets, oxygenLvl) {
+  return planets.map((planet) => {
+    if (oxygenLvl >= 19.5 && oxygenLvl <= 23.5) {
+      return planets;
+    } else return undefined;
+  });
+}
 
 /* ======= TESTS - DO NOT MODIFY ===== */
 

2-mandatory/3-bush-berries.js

@@ -22,7 +22,9 @@
 */
 
 function isBushSafe(berryArray) {
-  //Write your code here
+  if (berryArray.some((berry) => berry !== "pink")) {
+    return "Toxic! Leave bush alone!";
+  } else return "Bush is safe to eat from";
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */

2-mandatory/4-space-colonies.js

@@ -15,7 +15,11 @@
 
 */
 
-function getSettlers() {}
+function getSettlers(families) {
+  return families.filter(
+    (family) => family[0] === "A" && family.includes("family")
+  );
+}
 
 /* ======= TESTS - DO NOT MODIFY ===== */
 

2-mandatory/5-eligible-students.js

@@ -7,7 +7,9 @@
   - Returns an array containing only the names of the who have attended AT LEAST 8 classes
 */
 
-function getEligibleStudents() {}
+function getEligibleStudents(studentsAndAtt) {
+  return studentsAndAtt.filter((student) => student[1] >= 8);
+}
 
 /* ======= TESTS - DO NOT MODIFY ===== */
 

2-mandatory/6-journey-planner.js

@@ -10,7 +10,7 @@
  Now let's do this small exercise
 
  Using string methods update the checkCodeIsThere() function
-  - The function will have a string as a paramter
+  - The function will have a string as a parameter
   - The function should check if the word "code" exists in the string
   - If it does exist, return the index of it, if not return "Not found"
 
@@ -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(arr) {
+  return arr.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(transportArr, TransportStr) {
+  return transportArr.includes(TransportStr)
+}
 
 /*
   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(arr) {
+  return arr[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((arr) => arr.includes(transportMode))
+    .map((arr) => arr[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(streets) {
+  return streets.filter((street) => street.includes("Lane"));
+}
 
 /* ======= TESTS - DO NOT MODIFY ===== */