Added countVowels problem

L-B/0027 countVowels ( L-B )/README.md

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+# 0027 countVowels ( L-B )
+
+
+## Problem
+Write a function called countVowels that takes a string as input and returns the count of vowels (a, e, i, o, u) in the string. The function should be case-insensitive, meaning it should count both uppercase and lowercase vowels.
+
+## Solution
+
+```
+  //There are two ways to solve this problem 
+
+    //Solution #1
+    function countVowels(string) {
+
+        const str = string.toLowerCase();
+
+        let vowelCount = 0;
+
+        for (let i = 0; i < str.length; i++) {
+
+            if (str[i] === 'a' || str[i] === 'e' || str[i] === 'i' || str[i] === 'o' || str[i] === 'u') {
+                vowelCount++;
+            }
+        }
+
+        return vowelCount;
+    }
+
+    //Solution #2
+    function countVowels(str) {
+
+        str = str.toLowerCase();
+
+        const vowels = ['a', 'e', 'i', 'o', 'u'];
+
+        let vowelCount = 0;
+
+        for (let i = 0; i < str.length; i++) {
+
+            if (vowels.includes(str[i])) {
+                vowelCount++;
+            }
+        }
+
+        return vowelCount;
+    }
+```
+
+## How it works
+
+Solution #1
+- The function countVowels is defined, which takes a single parameter string, representing the input string for which we want to count the vowels.
+
+- Inside the function, a new variable str is declared and assigned the value of the input string converted to lowercase using the toLowerCase() method. This ensures that the function is case-insensitive and will count both uppercase and lowercase vowels.
+
+- Another variable vowelCount is declared and initialized to 0. This variable will be used to keep track of the count of vowels in the input string.
+
+- The function enters a for loop, iterating over each character of the str string. The loop starts from i = 0 and continues until i is less than the length of the string str.
+
+- Inside the loop, there's an if statement that checks if the current character str[i] is equal to any of the vowels 'a', 'e', 'i', 'o', or 'u'. If the condition is true (i.e., if str[i] is a vowel), then the vowelCount variable is incremented by 1.
+
+- After the loop finishes iterating through all characters in the string, the function returns the value of vowelCount, which represents the total count of vowels found in the input string.
+
+Solution #2
+- The function countVowels is defined, which takes a single parameter str, representing the input string for which we want to count the vowels.
+
+- Inside the function, the input string str is converted to lowercase using the toLowerCase() method. This ensures that the function is case-insensitive and will count both uppercase and lowercase vowels.
+
+- An array vowels is defined, containing the vowels 'a', 'e', 'i', 'o', and 'u'. This array will be used to check if a character in the string is a vowel.
+
+- Another variable vowelCount is declared and initialized to 0. This variable will be used to keep track of the count of vowels in the input string.
+
+- The function enters a for loop, iterating over each character of the str string. The loop starts from i = 0 and continues until i is less than the length of the string str.
+
+- Inside the loop, there's an if statement that checks if the current character str[i] is included in the vowels array using the includes method. If the condition is true (i.e., if str[i] is a vowel), then the vowelCount variable is incremented by 1.
+
+- After the loop finishes iterating through all characters in the string, the function returns the value of vowelCount, which represents the total count of vowels found in the input string.
+
+
+## References
+
+Below is a reference to a Stack Overflow discussion on alternative approaches to this problem.
+- [StackOverflow](https://stackoverflow.com/questions/29450399/counting-number-of-vowels-in-a-string-with-javascript)
+
+
+## Problem Added By
+Same as reference, use your any social links
+- [GitHub](https://github.com/henryarpon) 
+- [LinkedIn](https://www.linkedin.com/in/henryarpon/)
+
+## Contributing
+Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.
+
+Please make sure to update tests as appropriate.

L-B/0027 countVowels ( L-B )/countVowels_1.js

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+function countVowels(string) {
+
+    const str = string.toLowerCase();
+
+    let vowelCount = 0;
+
+    for (let i = 0; i < str.length; i++) {
+
+        if (str[i] === 'a' || str[i] === 'e' || str[i] === 'i' || str[i] === 'o' || str[i] === 'u') {
+            vowelCount++;
+        }
+    }
+
+    return vowelCount;
+}

L-B/0027 countVowels ( L-B )/countVowels_2.js

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+function countVowels(str) {
+
+    str = str.toLowerCase();
+
+    const vowels = ['a', 'e', 'i', 'o', 'u'];
+
+    let vowelCount = 0;
+
+    for (let i = 0; i < str.length; i++) {
+
+        if (vowels.includes(str[i])) {
+            vowelCount++;
+        }
+    }
+
+    return vowelCount;
+}