Challenge 23 & 24 Added

Author: sahilatahar

README.md

@@ -202,6 +202,22 @@ Write a function called `isLeapYear` that takes `year` in its parameter and retu
 
 [Solution Explanation](./solutions/ch_22_Check_Leap_Year/readme.md)
 
+## Challenge 23: Sum of Array Elements
+
+Write a JavaScript function to sum of all elements in an array.
+
+Write a function called `sumArray` that takes `array` in its parameter and returns sum of all array elements.
+
+[Solution Explanation](./solutions/ch_23_Sum_Of_Array_Elements/readme.md)
+
+## Challenge 24: Find Longest Word in Sentence
+
+Write a function to find the longest word in a sentence.
+
+Write a function called `findLongestWord` that takes string as argument `sentence` of type string and return longest word in sentence.
+
+[Solution Explanation](./solutions/ch_24_Find_Longest_Word_In_Sentence/readme.md)
+
 <!-- Add new challenges before this comment -->
 
 ## Contributors

solutions/ch_23_Sum_Of_Array_Elements/answer.js

@@ -0,0 +1,11 @@
+// Function to sum array elements
+function sumArray(array) {
+    let sum = 0;
+
+    // Run loop 
+    for (let i = 0; i < array.length; i++) {
+        // Add array element to sum
+        sum += array[i]; // sum = sum + array[i];
+    }
+    return sum;
+}

solutions/ch_23_Sum_Of_Array_Elements/answer2.js

@@ -0,0 +1,12 @@
+// Function to sum array elements
+function sumArray(array) {
+    let sum = 0;
+
+    // Use array forEach method
+    array.forEach(element => {
+        // Add element to sum
+        sum += element; // sum = sum + element;
+    });
+
+    return sum;
+}

solutions/ch_23_Sum_Of_Array_Elements/answer3.js

@@ -0,0 +1,5 @@
+// Function to sum array elements
+function sumArray(array) {
+    // Use array reduce method
+    return array.reduce((sum, num) => sum + num, 0);
+}

solutions/ch_23_Sum_Of_Array_Elements/readme.md

@@ -0,0 +1,60 @@
+# Challenge 23: Sum of Array Elements
+
+Write a JavaScript function to sum of all elements in an array.
+
+Write a function called `sumArray` that takes `array` in its parameter and returns sum of all array elements.
+
+## Answer 1
+
+```javascript
+// Function to sum array elements
+function sumArray(array) {
+  let sum = 0;
+
+  // Run loop
+  for (let i = 0; i < array.length; i++) {
+    // Add array element to sum
+    sum += array[i]; // sum = sum + array[i];
+  }
+  return sum;
+}
+```
+
+## Answer 1 Explanation
+
+The `sumArray` function takes `array` as input. Declare `sum` variable to store sum of all array elements. Run loop for each array element and add array element to `sum` and finally return `sum`.
+
+## Answer 2 (Array forEach Method)
+
+```javascript
+// Function to sum array elements
+function sumArray(array) {
+  let sum = 0;
+
+  // Use array forEach method
+  array.forEach((element) => {
+    // Add element to sum
+    sum += element; // sum = sum + element;
+  });
+
+  return sum;
+}
+```
+
+## Answer 2 Explanation
+
+The `sumArray` function takes `array` as input. Declare `sum` variable to store sum of all array elements. Use array `forEach()` method which run it for each array element and add array element to `sum` and return `sum`.
+
+## Answer 3 (Array Reduce Method)
+
+```javascript
+// Function to sum array elements
+function sumArray(array) {
+  // Use array reduce method
+  return array.reduce((sum, num) => sum + num, 0);
+}
+```
+
+## Answer 3 Explanation
+
+The `sumArray` function takes `array` as input and it uses the `reduce()` method to iterate over the array and return the sum of all elements.

solutions/ch_24_Find_Longest_Word_In_Sentence/answer.js

@@ -0,0 +1,15 @@
+// Function to find longest word in sentence
+function findLongestWord(sentence) {
+    // Split sentence words into array of words
+    const words = sentence.split(' ');
+
+    let longestWord = '';
+
+    // Run for of loop
+    for (let word of words) {
+        if (word.length > longestWord.length) {
+            longestWord = word;
+        }
+    }
+    return longestWord;
+}

solutions/ch_24_Find_Longest_Word_In_Sentence/readme.md

@@ -0,0 +1,29 @@
+# Challenge 24: Find Longest Word in Sentence
+
+Write a function to find the longest word in a sentence.
+
+Write a function called `findLongestWord` that takes string as argument `sentence` of type string and return longest word in sentence.
+
+## Answer
+
+```javascript
+// Function to find longest word in sentence
+function findLongestWord(sentence) {
+  // Split sentence words into array of words
+  const words = sentence.split(" ");
+
+  let longestWord = "";
+
+  // Run for of loop
+  for (let word of words) {
+    if (word.length > longestWord.length) {
+      longestWord = word;
+    }
+  }
+  return longestWord;
+}
+```
+
+## Answer Explanation
+
+The function `findLongestWord` takes string as argument and convert all words of `sentence` in array of word using `split()` method and array of word called `words`. After that using for of loop for each word checking condition if any word's length is more than current `longestWord's` length assign that word in `longestWord`.