Glasgow Class 6 - Man Sang Sin - JavaScript Core 1 - Week 4

2-mandatory/1-create-functions.js

@@ -3,15 +3,19 @@ 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(inputArray) {
+  firstFiveNumbersArr = inputArray.slice(0, 5);
+  return firstFiveNumbersArr;
 }
 
 /*
 Write a function that:
 - Accepts an array as a parameter.
 - Returns a new array containing the same elements, except sorted.
 */
-function sortArray() {
+function sortArray(inputArray) {
+  let sortedArr = inputArray.sort();
+  return sortedArr;
 }
 
 /*
@@ -24,7 +28,21 @@ Write a function that:
 - Removes any forward slashes (/) in the strings.
 - Makes the strings all lowercase.
 */
-function tidyUpString() {
+
+function removeSpaces(string) {
+  return string.trim();
+}
+
+function removeSlashes(string) {
+  return string.replace("/", "");
+}
+
+function makeLowercase(string) {
+  return string.toLowerCase();
+}
+
+function tidyUpString(inputArray) {
+  return inputArray.map(makeLowercase).map(removeSlashes).map(removeSpaces);
 }
 
 /*
@@ -33,7 +51,15 @@ Write a function that:
 - Returns a new array containing the same elements, but without the element at the passed index.
 */
 
-function remove() {
+function remove(inputArray, index) {
+  let returnArr = [];
+  for (let i = 0; i < index; i++) {
+    returnArr.push(inputArray[i]);
+  }
+  for (let i = index + 1; i < inputArray.length; i++) {
+    returnArr.push(inputArray[i]);
+  }
+  return returnArr;
 }
 
 /*
@@ -43,8 +69,24 @@ Write a function that:
 - The numbers must be rounded to 2 decimal places.
 - Numbers greater 100 must be replaced with 100.
 */
+function convertToPercentage(number) {
+  return `${number}%`;
+}
+
+function roundNumber(number) {
+  return Math.round(number * 100) / 100;
+}
+
+function belowhundred(number) {
+  if (number <= 100) {
+    return number;
+  } else {
+    return 100;
+  }
+}
 
-function formatPercentage() {
+function formatPercentage(inputArray) {
+  return inputArray.map(belowhundred).map(roundNumber).map(convertToPercentage);
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */

2-mandatory/2-oxygen-levels.js

@@ -11,7 +11,25 @@
     Some string methods that might help you here are .replace() and .substring().
 */
 
-function findSafeOxygenLevel() {}
+function removePercentage(percentString) {
+  percentString.replace("%", "");
+}
+
+function isAboveMinOxygenLevel(numberString) {
+  return 19.5 > Number(numberString);
+}
+
+function isBelowMaxOxygenLevel(numberString) {
+  return Number(numberString) < 23.5;
+}
+
+function findSafeOxygenLevel(input) {
+  validLevelsArr = input
+    .map(removePercentage)
+    .filter(isAboveMinOxygenLevel)
+    .filter(isBelowMaxOxygenLevel);
+  return validLevelsArr[0];
+}
 
 /* ======= TESTS - DO NOT MODIFY ===== */
 

2-mandatory/3-bush-berries.js

@@ -16,13 +16,21 @@
   The .some() method tests to see if some of the values (at least 1) in an array 
   match what you're looking for and returns true or false. 
 
-  The .every() method will only return true if all values match watch you're looking for. 
+  The .every() method will only return true if all values match what you're looking for. 
 
   Let's first look at an example that will teach you how to use these methods.
 */
 
+function isPink(colour) {
+  return colour === "pink";
+}
+
 function isBushSafe(berryArray) {
-  //Write your code here
+  if (berryArray.every(isPink) === true) {
+    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 +15,18 @@
 
 */
 
-function getSettlers() {}
+function isFamily(element) {
+  return element.includes("family");
+}
+
+function isNameStartwithA(name) {
+  return name[0] === "A";
+}
+
+function getSettlers(listOfElements) {
+  let validFamilies = listOfElements.filter(isFamily).filter(isNameStartwithA);
+  return validFamilies;
+}
 
 /* ======= TESTS - DO NOT MODIFY ===== */
 

2-mandatory/5-eligible-students.js

@@ -7,7 +7,17 @@
   - Returns an array containing only the names of the who have attended AT LEAST 8 classes
 */
 
-function getEligibleStudents() {}
+function isAttendanceOver8(studentRecord) {
+  return studentRecord[1] >= 8;
+}
+
+function returnName(studentRecord) {
+  return student[0];
+}
+
+function getEligibleStudents(studentList) {
+  return studentList.filter(isAttendanceOver8).map(returnName);
+}
 
 /* ======= 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 +64,10 @@ function checkCodeIsThere(stringText) {
 
   Hint: Use the corresponding array method to split the array.
 */
-function getTransportModes() {}
+function getTransportModes(locationTransportArr) {
+  let lastIndex = locationTransportArr.length;
+  return locationTransportArr.splice(1, lastIndex);
+}
 
 /*
   Implement the function isAccessibleByTransportMode that
@@ -81,7 +84,12 @@ function getTransportModes() {}
 
   Hint: Use the corresponding array method to decide if an element is included in an array.
 */
-function isAccessibleByTransportMode() {}
+function isAccessibleByTransportMode(
+  availableModeOfTransportArr,
+  chosenModeOfTransport
+) {
+  return availableModeOfTransportArr.includes(chosenModeOfTransport);
+}
 
 /*
   Implement the function getLocationName that
@@ -92,7 +100,9 @@ function isAccessibleByTransportMode() {}
    - Returns the name of the location
       e.g: "Tower Bridge"
 */
-function getLocationName() {}
+function getLocationName(locationTransportArr) {
+  return locationTransportArr[0];
+}
 
 /*
  We arrived at the final method. it won't take long if you use the previously implemented functions wisely.
@@ -122,7 +132,10 @@ function getLocationName() {}
   Advanced challange: try to use arrow function when invoking an array method.
 */
 function journeyPlanner(locations, transportMode) {
-  // Implement the function body
+  let accessibleLocations = locations
+    .filter((location) => location.includes(transportMode))
+    .map(getLocationName);
+  return accessibleLocations;
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */