added frequently asked questions

frequently-asked-questions/eight.js

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+//Write a function to check if two strings are anagrams.
+
+function areAnagrams(str1, str2) {
+    return str1.split('').sort().join('') === str2.split('').sort().join('');
+}
+

frequently-asked-questions/five.js

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+//Remove Duplicates from an Array
+
+function removeDuplicates(arr) {
+    return [...new Set(arr)];
+}
+

frequently-asked-questions/four.js

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+//Write a function to find the largest number in an array.
+
+function findLargest(arr) {
+    return Math.max(...arr);
+}
+

frequently-asked-questions/nine.js

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+// Write a function to calculate the sum of all elements in an array
+
+function sumArray(arr) {
+    return arr.reduce((acc, curr) => acc + curr, 0);
+}
+

frequently-asked-questions/one.js

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+//Write a function to reverse a string.
+
+function findLargest(arr) {
+    return Math.max(...arr);
+}
+

frequently-asked-questions/seven.js

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+//Write a function to count the number of vowels in a string.
+
+function countVowels(str) {
+    return (str.match(/[aeiou]/gi) || []).length;
+}
+

frequently-asked-questions/six.js

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+// Write a function to flatten a nested array.
+
+function removeDuplicates(arr) {
+    return [...new Set(arr)];
+}
+

frequently-asked-questions/ten.js

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+//Write a function to find the factorial of a number.
+
+function factorial(n) {
+    return n <= 1 ? 1 : n * factorial(n - 1);
+}
+

frequently-asked-questions/three.js

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+//Write a function to return the nth Fibonacci number.
+
+function fibonacci(n) {
+    return n <= 1 ? n : fibonacci(n - 1) + fibonacci(n - 2);
+}
+

frequently-asked-questions/two.js

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+//Write a function to check if a string is a palindrome.
+
+function isPalindrome(str) {
+    return str === str.split('').reverse().join('');
+}
+