Solution

arrays-basics.js

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+/**************************************************************
+ Task 8 (logArray): 
+   Create a function logArray that receives an array as a parameter and logs each item in the array.
+**************************************************************/
+function logArray(arr) {
+  arr.forEach((value, index) => {
+    console.log(value);
+  });
+}
+
+// logArray([1, 2, 3, 4, 5]);
+
+/**************************************************************
+   Task 9 (logArrayWithIndex): 
+     Create a function logArrayWithIndex that receives an array as a parameter and logs each item in the array along with its index.
+  **************************************************************/
+function logArrayWithIndex(arr) {
+  arr.forEach((value, index) => {
+    console.log(index);
+  });
+}
+
+// logArrayWithIndex(["apple", "banana", "orange"]);
+
+/**************************************************************
+   Task 10 (logEvenNumbers): 
+     Create a function logEvenNumbers that receives an array of numbers as a parameter and logs only the even numbers in the array.
+  **************************************************************/
+function logEvenNumbers(arr) {
+  let evenNumber = arr.filter((value, index) => {
+    return value % 2 === 0;
+  });
+  console.log(evenNumber);
+}
+
+// logEvenNumbers([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
+/**************************************************************
+   Task 11 (logArrayBackwards): 
+     Create a function logArrayBackwards that receives an array as a parameter and logs each item in the array in reverse order.
+  **************************************************************/
+function logArrayBackwards(arr) {
+  const backWords = arr.map((value, index) => {
+    return arr[arr.length - 1 - index];
+  });
+  console.log(backWords);
+}
+
+// logArrayBackwards(["one", "two", "three", "four"]);
+
+/**************************************************************
+   Task 12 (logLastItem): 
+     Create a function logLastItem that receives an array as a parameter and logs the last item in the array.
+  **************************************************************/
+function logLastItem(arr) {
+  const lastItem = arr.find((value, index) => {
+    return value[arr.length - 1 - index];
+  });
+  console.log(lastItem);
+}
+
+// logLastItem(["a", "b", "c", "d"]);
+
+/**************************************************************
+   Task 13 (logArrayInChunks): 
+     Create a function logArrayInChunks that receives an array and a chunk size as parameters and logs the items in the array in chunks of the specified size.
+  **************************************************************/
+function logArrayInChunks(arr, chunkSize) {
+  for (let i = 0; i < arr.length; i += chunkSize) {
+    const chunk = arr.slice(i, i + chunkSize);
+    console.log(chunk);
+  }
+}
+
+// logArrayInChunks([1, 2, 3, 4, 5, 6, 7, 8, 9], 3);

arrays-intermediate.js

@@ -0,0 +1,198 @@
+/**************************************************************
+ Task 1: 
+   Create a function sumArray that receives an array of numbers as a parameter and returns the sum of all the numbers in the array.
+   Hint: Use the .reduce() method
+**************************************************************/
+function sumArray(numbers) {
+  //TODO: Add your code here
+  return numbers.reduce(
+    (accumulator, currentNumber) => accumulator + currentNumber
+  );
+}
+// console.log(sumArray([4, 3, 2, 5, -10]));
+
+/**************************************************************
+ Task 2:
+  Create a function findFirstStringStartingWithA that receives an array of strings as a parameter
+  and returns the first string that starts with the letter given letter.
+
+  Hint: Use the .find() and .startsWith() methods
+**************************************************************/
+function findFirstStringStartingWithLetter(letter, strings) {
+  //TODO: Add your code here
+  return strings.find((value, index) => value.toLowerCase().startsWith(letter));
+}
+// console.log(
+//   findFirstStringStartingWithLetter("h", ["Memory", "Hello", "Happy"])
+// );
+
+/**************************************************************
+ Task 3:
+  Create a function isPresentIncluded that receives an array of presents as a parameter and uses the includes method to check 
+  if a present is included in the array.
+
+  Hint: Use the .map() and .includes() methods
+**************************************************************/
+function isPresentIncluded(presentName, presents) {
+  //TODO: Add your code here
+  return presents.map((value) => value.toLowerCase()).includes(presentName);
+}
+// console.log(
+//   isPresentIncluded("puzzle", [
+//     "Sparkling Surprise",
+//     "Enchanted Elegance",
+//     "Whimsical Wonder",
+//     "Joyful Jingle",
+//     "Puzzle",
+//   ])
+// );
+
+/**************************************************************
+ Task 4:
+  Create a function sortStudentsAlphabetically that receives an array of students name as a parameter 
+  and uses the sort method to sort the strings in alphabetical order.
+
+  Hint: Use the .sort() method
+**************************************************************/
+function sortStudentsAlphabetically(students) {
+  //TODO: Add your code here
+  return students.sort();
+}
+// console.log(
+//   sortStudentsAlphabetically([
+//     "Eve",
+//     "Jasmia",
+//     "Husnia",
+//     "Grace",
+//     "Bob",
+//     "Charlie",
+//     "Alice",
+//     "Dave",
+//     "Um abbas",
+//     "Frank",
+//   ])
+// );
+
+/**************************************************************
+  Task 5:
+   Create a function that takes an array of numbers as input, separates the odd and even numbers, and returns two new arrays.
+   - Hint: Use the forEach method.
+   - const [odds, evens] = separateOddEven([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
+   - console.log(odds); // Output: [1, 3, 5, 7, 9]
+   - console.log(evens); // Output: [2, 4, 6, 8, 10]
+
+   Hint: Use the .forEach() and .push() methods
+**************************************************************/
+function separateOddEven(numbers) {
+  //TODO: Add your code here
+  let odds = [];
+  let evens = [];
+  numbers.forEach((value) => {
+    if (value % 2 === 0) {
+      evens.push(value);
+    } else {
+      odds.push(value);
+    }
+  });
+  return { odds, evens };
+}
+// console.log(separateOddEven([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]));
+
+/**************************************************************
+ Task 6:
+  Create a function that takes two parameters: a code that represents an item, and an array of item codes, then removes the item with the given code from the system.
+  - Hint: Use the filter method.
+  - e.g
+ const items = [
+   { code: '#153', name: 'Ball' },
+   { code: '#147', name: 'Scissors' },
+   { code: '#249', name: 'Pillow' },
+   { code: '#149', name: 'Tissue' }
+    ];
+
+  const updatedItems = removeItem('#153', items);
+  console.log(updatedItems); // Output: [{ code: "#147", name: "Scissors" }, { code: "#249", name: "Pillow" }, { code: "#149", name: "Tissue" },];
+
+  Hint: Use the .filter and .startsWith method
+**************************************************************/
+function removeItem(code, items) {
+  //TODO: Add your code here
+  return items.filter((value) => {
+    value.code !== code;
+  });
+}
+// console.log(
+//   removeItem("#153", [
+//     { code: "#153", name: "Ball" },
+//     { code: "#147", name: "Scissors" },
+//     { code: "#249", name: "Pillow" },
+//     { code: "#149", name: "Tissue" },
+//   ])
+// );
+
+/**************************************************************
+Task 7:
+   Write a function that takes an array of objects representing students, with properties like firstName, lastName, grade, and 
+    type (nerd or regular), and a curve which represents the amount of the curve. The function should return a new array with 
+     updated grades, with nerds receiving a negative curve and regular students receiving a positive curve.
+   - Hint: Use the map method.
+   - e.g
+  const students = [
+    { firstName: "Jaber", lastName: "jabarbar", grade: 10, type: "regular" },
+    { firstName: "Hamza", lastName: "Alhamazi", grade: 12, type: "regular" },
+    { firstName: "Jasem", lastName: "Jamasmas", grade: 15, type: "nerd" },
+    { firstName: "Kadhim", lastName: "Khadhmia", grade: 5, type: "regular" },
+    { firstName: "Um Abbas", lastName: "IDK", grade: 20, type: "nerd" },
+    { firstName: "Johny", lastName: "Micle", grade: 10, type: "regular" },
+    ];
+  const updatedGrades = updateGrades(students, 10);
+  console.log(updatedGrades);
+
+  Output:
+   [
+     {
+       firstName: "Jaber",
+       lastName: "jabarbar",
+       grade: 20,
+       type: "regular",
+     },
+     {
+       firstName: "Hamza",
+       lastName: "Alhamazi",
+       grade: 22,
+       type: "regular",
+     },
+     { firstName: "Jasem", lastName: "Jamasmas", grade: 5, type: "nerd" },
+     {
+       firstName: "Kadhim",
+       lastName: "Khadhmia",
+       grade: 15,
+       type: "regular",
+     },
+     { firstName: "Um Abbas", lastName: "Winston", grade: 10, type: "nerd" },
+     { firstName: "Johny", lastName: "Micle", grade: 20, type: "regular" },
+   ];
+
+   Hint: Use the .map method and separator operator
+**************************************************************/
+function updateGrades(curve, students) {
+  //TODO: Add your code here
+  return students.map((value) => {
+    if (value.type === "nerd") {
+      return { ...value, grade: value.grade - curve };
+    } else {
+      return { ...value, grade: value.grade + curve };
+    }
+  });
+}
+
+// console.log(
+//   updateGrades(10, [
+//     { firstName: "Jaber", lastName: "jabarbar", grade: 10, type: "regular" },
+//     { firstName: "Hamza", lastName: "Alhamazi", grade: 12, type: "regular" },
+//     { firstName: "Jasem", lastName: "Jamasmas", grade: 15, type: "nerd" },
+//     { firstName: "Kadhim", lastName: "Khadhmia", grade: 5, type: "regular" },
+//     { firstName: "Um Abbas", lastName: "IDK", grade: 20, type: "nerd" },
+//     { firstName: "Johny", lastName: "Micle", grade: 10, type: "regular" },
+//   ])
+// );

index.html

@@ -1,12 +1,12 @@
 <!DOCTYPE html>
 <html lang="en">
-<head>
-    <meta charset="UTF-8">
-    <meta http-equiv="X-UA-Compatible" content="IE=edge">
-    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <head>
+    <meta charset="UTF-8" />
+    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <title>Arrays</title>
-</head>
-<body>
-    <script src="./arrays.js" type="module" />
-</body>
-</html>
+  </head>
+  <body>
+    <script src="./reviewers.js" type="module" />
+  </body>
+</html>