diff --git a/src/index.js b/src/index.js
index 384ba5f..7524583 100644
--- a/src/index.js
+++ b/src/index.js
@@ -30,8 +30,8 @@ const bindValue = (value, el, binding, vnode) => {
 }
 
 const unbindValue = (value, el) => {
-  for (let item in value) {
-    const k = value[item].join('')
+  for (let key in value) {
+    const k = ShortKey.encodeKey(value[key])
     const idxElm = mapFunctions[k].el.indexOf(el)
     if (mapFunctions[k].el.length > 1 && idxElm > -1) {
       mapFunctions[k].el.splice(idxElm, 1)
@@ -63,7 +63,20 @@ ShortKey.install = (Vue, options) => {
   })
 }
 
-ShortKey.decodeKey = (pKey) => {
+ShortKey.decodeKey = (pKey) => createShortcutIndex(pKey)
+ShortKey.encodeKey = (pKey) => {
+  const shortKey = {}
+  shortKey.shiftKey = pKey.includes('shift')
+  shortKey.ctrlKey = pKey.includes('ctrl')
+  shortKey.metaKey = pKey.includes('meta')
+  shortKey.altKey = pKey.includes('alt')
+  let indexedKeys = createShortcutIndex(shortKey)
+  const vKey = pKey.filter((item) => !['shift', 'ctrl', 'meta', 'alt'].includes(item))
+  indexedKeys += vKey.join('')
+  return indexedKeys
+}
+
+const createShortcutIndex = (pKey) => {
   let k = ''
   if (pKey.key === 'Shift' || pKey.shiftKey) { k += 'shift' }
   if (pKey.key === 'Control' || pKey.ctrlKey) { k += 'ctrl' }
@@ -143,7 +156,7 @@ if (process && process.env && process.env.NODE_ENV !== 'test') {
 
 const mappingFunctions = ({b, push, once, focus, el}) => {
   for (let key in b) {
-    const k = b[key].join('')
+    const k = ShortKey.encodeKey(b[key])
     const elm = mapFunctions[k] && mapFunctions[k].el ? mapFunctions[k].el : []
     elm.push(el)
     mapFunctions[k] = {
@@ -159,7 +172,6 @@ const mappingFunctions = ({b, push, once, focus, el}) => {
 const availableElement = (decodedKey) => {
   const objectIsAvoided = !!objAvoided.find(r => r === document.activeElement)
   const filterAvoided = !!(elementAvoided.find(selector => document.activeElement && document.activeElement.matches(selector)))
-
   return !!mapFunctions[decodedKey] && !(objectIsAvoided || filterAvoided)
 }
 
diff --git a/test/Pollyfills.js b/test/Pollyfills.js
new file mode 100644
index 0000000..93de8d4
--- /dev/null
+++ b/test/Pollyfills.js
@@ -0,0 +1,80 @@
+// https://tc39.github.io/ecma262/#sec-array.prototype.includes
+if (!Array.prototype.includes) {
+  Object.defineProperty(Array.prototype, 'includes', {
+    value: function(searchElement, fromIndex) {
+
+      // 1. Let O be ? ToObject(this value).
+      if (this == null) {
+        throw new TypeError('"this" is null or not defined');
+      }
+
+      var o = Object(this);
+
+      // 2. Let len be ? ToLength(? Get(O, "length")).
+      var len = o.length >>> 0;
+
+      // 3. If len is 0, return false.
+      if (len === 0) {
+        return false;
+      }
+
+      // 4. Let n be ? ToInteger(fromIndex).
+      //    (If fromIndex is undefined, this step produces the value 0.)
+      var n = fromIndex | 0;
+
+      // 5. If n ≥ 0, then
+      //  a. Let k be n.
+      // 6. Else n < 0,
+      //  a. Let k be len + n.
+      //  b. If k < 0, let k be 0.
+      var k = Math.max(n >= 0 ? n : len - Math.abs(n), 0);
+
+      // 7. Repeat, while k < len
+      while (k < len) {
+        // a. Let elementK be the result of ? Get(O, ! ToString(k)).
+        // b. If SameValueZero(searchElement, elementK) is true, return true.
+        // c. Increase k by 1.
+        // NOTE: === provides the correct "SameValueZero" comparison needed here.
+        if (o[k] === searchElement) {
+          return true;
+        }
+        k++;
+      }
+
+      // 8. Return false
+      return false;
+    }
+  });
+}
+
+if (!Object.assign) {
+  Object.defineProperty(Object, 'assign', {
+    enumerable: false,
+    configurable: true,
+    writable: true,
+    value: function(target, firstSource) {
+      'use strict';
+      if (target === undefined || target === null) {
+        throw new TypeError('Cannot convert first argument to object');
+      }
+
+      var to = Object(target);
+      for (var i = 1; i < arguments.length; i++) {
+        var nextSource = arguments[i];
+        if (nextSource === undefined || nextSource === null) {
+          continue;
+        }
+
+        var keysArray = Object.keys(Object(nextSource));
+        for (var nextIndex = 0, len = keysArray.length; nextIndex < len; nextIndex++) {
+          var nextKey = keysArray[nextIndex];
+          var desc = Object.getOwnPropertyDescriptor(nextSource, nextKey);
+          if (desc !== undefined && desc.enumerable) {
+            to[nextKey] = nextSource[nextKey];
+          }
+        }
+      }
+      return to;
+    }
+  });
+}
diff --git a/test/index.test.js b/test/index.test.js
index cc7d5fd..4b0091d 100644
--- a/test/index.test.js
+++ b/test/index.test.js
@@ -1,3 +1,4 @@
+import './Pollyfills'
 import find from  'array.prototype.find'
 import {expect} from 'chai'
 import Vue from 'vue'