added interview question array

InterviewQuestions/findSecondLargestElementInArray.js

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+/**
+ * Problem statement: Find second largest element in the array. Consider the case wherein duplicates can exist
+ * arr = [12, 35, 1, 10, 34, 35, 35] - Here 35 occurs 3 times, but second largest element should be 34
+ */
+function findSecondLargestElementInArray(arr) {
+  let largest = -1,
+    secondLargest = -1;
+
+  for (let i = 0; i <= arr.length - 1; i++) {
+    if (arr[i] > largest) {
+      secondLargest = largest;
+      largest = arr[i];
+    } else if (arr[i] > secondLargest && arr[i] != largest) {
+      secondLargest = arr[i];
+    }
+  }
+  console.log(secondLargest);
+}
+let arr = [12, 35, 1, 10, 34, 35, 35];
+findSecondLargestElementInArray(arr);

Snippets/Strings/lowerCaseConverter.js

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+// toLowerCase() method changes the string to lowercase letters.
+let favLanguage = "JavasCript";
+console.log(favLanguage.toLowerCase()); // javascript
+let standard = "ECMA";
+console.log(standard.toLowerCase()); // ecma
+let oneMoreLangugae = "PHP";
+console.log(oneMoreLangugae.toLowerCase()); // php

Snippets/Strings/upperCaseConverter.js

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+// toUpperCase() method changes the string to upper letters.
+let favLanguage = "JavasCript";
+console.log(favLanguage.toUpperCase()); // JAVASCRIPT
+let firstName = "ECMA";
+console.log(firstName.toUpperCase()); // ECMA
+let oneMoreLangugae = "Python";
+console.log(oneMoreLangugae.toUpperCase()); // PYTHON