--update: initial implementation

Author: ashokdey

src/_Classics_/caeser_cipher/index.js

@@ -0,0 +1,24 @@
+function caeserCipher(str, num) {
+  const lowerCaseString = str.toLowerCase();
+  const alphabets = 'abcdefghijklmnopqrstuvwxyz'.split('');
+  let result = '';
+
+  for (let char of lowerCaseString) {
+    const current = char;
+    if (current === ' ') {
+      result += current;
+      continue;
+    }
+
+    const currentIndex = alphabets.indexOf(current);
+    let newIndex = currentIndex + num;
+
+    if (newIndex > alphabets.length - 1) {
+      newIndex -= alphabets.length;
+    }
+    result += alphabets[newIndex];
+  }
+  return result;
+}
+
+console.log(caeserCipher('abcz', 2));