Added Caesar-Cipher problem solution

Author: ParrotStone

Caesar Cipher/main.js

@@ -0,0 +1,41 @@
+#!/usr/bin/env node
+
+// Problem Description at -> https://www.hackerrank.com/challenges/caesar-cipher-1/problem
+
+
+// O(N) Solution
+function caesarCipher(s, k) {
+ let encryptedOutput = '';
+
+ for (let i = 0; i < s.length; i++) {
+ let encryptedCharCode = s[i].charCodeAt(0) + k;
+
+ if (encryptedCharCode > 122)
+ // Alternative traditional O(n^2) solution approach
+// while (encryptedCharCode > 122) encryptedCharCode -= 26;
+ encryptedCharCode = ((encryptedCharCode - 97) % 26) + 97;
+
+ if (encryptedCharCode > 90 && /[A-Z]/.test(s[i]))
+// while (encryptedCharCode > 90) encryptedCharCode -= 26;
+ encryptedCharCode = ((encryptedCharCode - 65) % 26) + 65;
+
+ const encryptedChar = String.fromCharCode(encryptedCharCode);
+ // A regex to exclude the numbers and symbols from the output character set
+ encryptedOutput += /[-!$%^&*()_+|~=`{}\[\]:";'<>?,\\.\/]|[0-9]/.test(s[i]) ? s[i] : encryptedChar;
+ }
+
+ return encryptedOutput;
+}
+
+// Test cases
+// console.log(caesarCipher('middle-Outz', 2)); // okffng-Qwvb
+// console.log(caesarCipher('There\'s-a-starman-waiting-in-the-sky', 3)); // Wkhuh'v-d-vwdupdq-zdlwlqj-lq-wkh-vnb
+// console.log(caesarCipher('This-is-a-string', 7)); // Aopz-pz-h-zaypun
+// console.log(caesarCipher('This-is-a-string', 0)); // This-is-a-string
+console.log(
+caesarCipher(
+'DNFjxo?b5h*5<LWbgs6?V5{3M].1hG)pv1VWq4(!][DZ3G)riSJ.CmUj9]7Gzl?VyeJ2dIPEW4GYW*scT8(vhu9wCr]q!7eyaoy.', 100));
+// WGYcqh?u5a*5<EPuzl6?O5{3F].1aZ)io1OPj4(!][WS3Z)kbLC.VfNc9]7Zse?OrxC2wBIXP4ZRP*lvM8(oan9pVk]j!7xrthr.
+// console.log(caesarCipher('w', 100)); // v
+// console.log(caesarCipher('x', 55)); // a
+// console.log(caesarCipher('a', 45)); // t