diff --git a/dist/_30s.es5.js b/dist/_30s.es5.js
index d6c0d395f..064476b56 100644
--- a/dist/_30s.es5.js
+++ b/dist/_30s.es5.js
@@ -521,6 +521,7 @@
           return h === handler;
         });
         if (i > -1) this.hub[event].splice(i, 1);
+        if (this.hub[event].length === 0) delete this.hub[event];
       }
     };
   };
diff --git a/dist/_30s.es5.min.js b/dist/_30s.es5.min.js
index 67e8717aa..fa33f6641 100644
--- a/dist/_30s.es5.min.js
+++ b/dist/_30s.es5.min.js
@@ -1 +1 @@
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i=_.apply(Math,o(t.map(function(e){return e.length})));return Array.from({length:i}).map(function(e,n){return Array.from({length:t.length},function(e,i){return t[i][n]})})},e.zipObject=function(e,t){return e.reduce(function(e,n,i){return e[n]=t[i],e},{})},e.zipWith=function(){for(var e=arguments.length,t=Array(e),n=0;n<e;n++)t[n]=arguments[n];var r='function'==typeof t[t.length-1]?t.pop():void 0;return Array.from({length:_.apply(Math,o(t.map(function(e){return e.length})))},function(e,n){return r?r.apply(void 0,o(t.map(function(e){return e[n]}))):t.map(function(e){return e[n]})})},Object.defineProperty(e,'__esModule',{value:!0})});
diff --git a/dist/_30s.esm.js b/dist/_30s.esm.js
index da1813dea..6ab1aae47 100644
--- a/dist/_30s.esm.js
+++ b/dist/_30s.esm.js
@@ -202,6 +202,7 @@ const createEventHub = () => ({
   off(event, handler) {
     const i = (this.hub[event] || []).findIndex(h => h === handler);
     if (i > -1) this.hub[event].splice(i, 1);
+    if (this.hub[event].length === 0) delete this.hub[event];
   }
 });
 const currentURL = () => window.location.href;
diff --git a/dist/_30s.js b/dist/_30s.js
index 394fa39a5..254c7f14a 100644
--- a/dist/_30s.js
+++ b/dist/_30s.js
@@ -208,6 +208,7 @@
     off(event, handler) {
       const i = (this.hub[event] || []).findIndex(h => h === handler);
       if (i > -1) this.hub[event].splice(i, 1);
+      if (this.hub[event].length === 0) delete this.hub[event];
     }
   });
   const currentURL = () => window.location.href;
diff --git a/snippet_data/snippetList.json b/snippet_data/snippetList.json
index d2b1c6f58..548c44c47 100644
--- a/snippet_data/snippetList.json
+++ b/snippet_data/snippetList.json
@@ -386,7 +386,7 @@
         "archived": false
       },
       "meta": {
-        "hash": "92073a46ed91184fb52d53ecc1ef1265c8eaf3e13f9715796a4c19ebed2e9556"
+        "hash": "f6aaee6ddb2ff7884f5bc5b5d37d1def44b549c3b260f4522ab812f5d163996c"
       }
     },
     {
@@ -662,7 +662,7 @@
         "archived": false
       },
       "meta": {
-        "hash": "02438b83d413dbd5aede2eed7381f3038c4627135b63130ffdca48fdb6fbbc91"
+        "hash": "04bd2a9cc85162867e958777b84598feecb772344bd1d8d3cc9b319fb14a98f4"
       }
     },
     {
diff --git a/snippet_data/snippets.json b/snippet_data/snippets.json
index cb2da6a9a..41e314684 100644
--- a/snippet_data/snippets.json
+++ b/snippet_data/snippets.json
@@ -568,7 +568,7 @@
       },
       "meta": {
         "archived": false,
-        "hash": "92073a46ed91184fb52d53ecc1ef1265c8eaf3e13f9715796a4c19ebed2e9556"
+        "hash": "f6aaee6ddb2ff7884f5bc5b5d37d1def44b549c3b260f4522ab812f5d163996c"
       }
     },
     {
@@ -965,8 +965,8 @@
         "fileName": "createEventHub.md",
         "text": "Creates a pub/sub ([publish–subscribe](https://en.wikipedia.org/wiki/Publish%E2%80%93subscribe_pattern)) event hub with `emit`, `on`, and `off` methods.\n\nUse `Object.create(null)` to create an empty `hub` object that does not inherit properties from `Object.prototype`.\nFor `emit`, resolve the array of handlers based on the `event` argument and then run each one with `Array.prototype.forEach()` by passing in the data as an argument.\nFor `on`, create an array for the event if it does not yet exist, then use `Array.prototype.push()` to add the handler\nto the array.\nFor `off`, use `Array.prototype.findIndex()` to find the index of the handler in the event array and remove it using `Array.prototype.splice()`.",
         "codeBlocks": {
-          "es6": "const createEventHub = () => ({\n  hub: Object.create(null),\n  emit(event, data) {\n    (this.hub[event] || []).forEach(handler => handler(data));\n  },\n  on(event, handler) {\n    if (!this.hub[event]) this.hub[event] = [];\n    this.hub[event].push(handler);\n  },\n  off(event, handler) {\n    const i = (this.hub[event] || []).findIndex(h => h === handler);\n    if (i > -1) this.hub[event].splice(i, 1);\n    if (this.hub[event].length === 0) delete this.hub[event]\n  }\n});",
-          "es5": "var createEventHub = function createEventHub() {\n  return {\n    hub: Object.create(null),\n    emit: function emit(event, data) {\n      (this.hub[event] || []).forEach(function (handler) {\n        return handler(data);\n      });\n    },\n    on: function on(event, handler) {\n      if (!this.hub[event]) this.hub[event] = [];\n      this.hub[event].push(handler);\n    },\n    off: function off(event, handler) {\n      var i = (this.hub[event] || []).findIndex(function (h) {\n        return h === handler;\n      });\n      if (i > -1) this.hub[event].splice(i, 1);\n      if (this.hub[event].length === 0) delete this.hub[event]\n    }\n  };\n};",
+          "es6": "const createEventHub = () => ({\n  hub: Object.create(null),\n  emit(event, data) {\n    (this.hub[event] || []).forEach(handler => handler(data));\n  },\n  on(event, handler) {\n    if (!this.hub[event]) this.hub[event] = [];\n    this.hub[event].push(handler);\n  },\n  off(event, handler) {\n    const i = (this.hub[event] || []).findIndex(h => h === handler);\n    if (i > -1) this.hub[event].splice(i, 1);\n    if (this.hub[event].length === 0) delete this.hub[event];\n  }\n});",
+          "es5": "var createEventHub = function createEventHub() {\n  return {\n    hub: Object.create(null),\n    emit: function emit(event, data) {\n      (this.hub[event] || []).forEach(function (handler) {\n        return handler(data);\n      });\n    },\n    on: function on(event, handler) {\n      if (!this.hub[event]) this.hub[event] = [];\n      this.hub[event].push(handler);\n    },\n    off: function off(event, handler) {\n      var i = (this.hub[event] || []).findIndex(function (h) {\n        return h === handler;\n      });\n      if (i > -1) this.hub[event].splice(i, 1);\n      if (this.hub[event].length === 0) delete this.hub[event];\n    }\n  };\n};",
           "example": "const handler = data => console.log(data);\nconst hub = createEventHub();\nlet increment = 0;\n\n// Subscribe: listen for different types of events\nhub.on('message', handler);\nhub.on('message', () => console.log('Message event fired'));\nhub.on('increment', () => increment++);\n\n// Publish: emit events to invoke all handlers subscribed to them, passing the data to them as an argument\nhub.emit('message', 'hello world'); // logs 'hello world' and 'Message event fired'\nhub.emit('message', { hello: 'world' }); // logs the object and 'Message event fired'\nhub.emit('increment'); // `increment` variable is now 1\n\n// Unsubscribe: stop a specific handler from listening to the 'message' event\nhub.off('message', handler);"
         },
         "tags": [
@@ -977,7 +977,7 @@
       },
       "meta": {
         "archived": false,
-        "hash": "02438b83d413dbd5aede2eed7381f3038c4627135b63130ffdca48fdb6fbbc91"
+        "hash": "04bd2a9cc85162867e958777b84598feecb772344bd1d8d3cc9b319fb14a98f4"
       }
     },
     {
diff --git a/vscode_snippets/snippets.json b/vscode_snippets/snippets.json
index 6f634e58e..103e9be86 100644
--- a/vscode_snippets/snippets.json
+++ b/vscode_snippets/snippets.json
@@ -423,7 +423,7 @@
       "  off(event, handler) {",
       "    const i = (this.hub[event] || []).findIndex(h => h === handler);",
       "    if (i > -1) this.hub[event].splice(i, 1);",
-      "    if (this.hub[event].length === 0) delete this.hub[event]",
+      "    if (this.hub[event].length === 0) delete this.hub[event];",
       "  }",
       "});"
     ],