Update all new Tasks

Task/Move-to-front-algorithm/JavaScript/move-to-front-algorithm.js

@@ -0,0 +1,20 @@
+var encodeMTF = function (word) {
+  var init = {wordAsNumbers: [], charList: 'abcdefghijklmnopqrstuvwxyz'.split('')};
+
+  return word.split('').reduce(function (acc, char) {
+    var charNum = acc.charList.indexOf(char); //get index of char
+    acc.wordAsNumbers.push(charNum); //add original index to acc
+    acc.charList.unshift(acc.charList.splice(charNum, 1)[0]); //put at beginning of list
+    return acc;
+  }, init).wordAsNumbers; //return number list
+};
+
+var decodeMTF = function (numList) {
+  var init = {word: '', charList: 'abcdefghijklmnopqrstuvwxyz'.split('')};
+
+  return numList.reduce(function (acc, num) {
+    acc.word += acc.charList[num];
+    acc.charList.unshift(acc.charList.splice(num, 1)[0]); //put at beginning of list
+    return acc;
+  }, init).word;
+};