diff --git a/README.md b/README.md
index 979531a63..220194568 100644
--- a/README.md
+++ b/README.md
@@ -3416,6 +3416,7 @@ 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];
   }
 });
 ```
@@ -4738,6 +4739,7 @@ const checkProp = (predicate, prop) => obj => !!predicate(obj[prop]);
 
 
 
+
 const lengthIs4 = checkProp(l => l === 4, 'length');
 lengthIs4([]); // false
 lengthIs4([1,2,3,4]); // true
diff --git a/docs/browser.html b/docs/browser.html
index bc93e07d2..cff87c8b0 100644
--- a/docs/browser.html
+++ b/docs/browser.html
@@ -155,7 +155,8 @@ console<span class="token punctuation">.</span><span class="token function">log<
   },</span>
   <span class="token function">off</span><span class="token punctuation">(</span>event<span class="token punctuation">,</span> handler<span class="token punctuation">) {</span>
     <span class="token keyword">const</span> i <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>hub<span class="token punctuation">[</span>event<span class="token punctuation">]</span> <span class="token operator">||</span> <span class="token punctuation">[]).</span><span class="token function">findIndex</span><span class="token punctuation">(</span>h <span class="token operator">=></span> h <span class="token operator">===</span> handler<span class="token punctuation">);</span>
-    <span class="token keyword">if</span> <span class="token punctuation">(</span>i <span class="token operator">> -</span><span class="token number">1</span><span class="token punctuation">)</span> <span class="token keyword">this</span><span class="token punctuation">.</span>hub<span class="token punctuation">[</span>event<span class="token punctuation">].</span><span class="token function">splice</span><span class="token punctuation">(</span>i<span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">);
+    <span class="token keyword">if</span> <span class="token punctuation">(</span>i <span class="token operator">> -</span><span class="token number">1</span><span class="token punctuation">)</span> <span class="token keyword">this</span><span class="token punctuation">.</span>hub<span class="token punctuation">[</span>event<span class="token punctuation">].</span><span class="token function">splice</span><span class="token punctuation">(</span>i<span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">);</span>
+    <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>hub<span class="token punctuation">[</span>event<span class="token punctuation">].</span>length <span class="token operator">===</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token keyword">delete this</span><span class="token punctuation">.</span>hub<span class="token punctuation">[</span>event<span class="token punctuation">];
   }
 });</span>
 </pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token keyword">const</span> <span class="token function-variable function">handler</span> <span class="token operator">=</span> data <span class="token operator">=></span> console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>data<span class="token punctuation">);</span>
diff --git a/docs/function.html b/docs/function.html
index efccc0759..2b9ef5087 100644
--- a/docs/function.html
+++ b/docs/function.html
@@ -155,6 +155,7 @@ console<span class="token punctuation">.</span><span class="token function">log<
 
 
 
+
 <span class="token keyword">const</span> lengthIs4 <span class="token operator">=</span> <span class="token function">checkProp</span><span class="token punctuation">(</span>l <span class="token operator">=></span> l <span class="token operator">===</span> <span class="token number">4</span><span class="token punctuation">,</span> <span class="token string">'length'</span><span class="token punctuation">);</span>
 <span class="token function">lengthIs4</span><span class="token punctuation">([]);</span> <span class="token comment">// false</span>
 <span class="token function">lengthIs4</span><span class="token punctuation">([</span><span class="token number">1</span><span class="token punctuation">,</span><span class="token number">2</span><span class="token punctuation">,</span><span class="token number">3</span><span class="token punctuation">,</span><span class="token number">4</span><span class="token punctuation">]);</span> <span class="token comment">// true</span>
diff --git a/snippets/checkProp.md b/snippets/checkProp.md
index 391d872d6..3262f3969 100644
--- a/snippets/checkProp.md
+++ b/snippets/checkProp.md
@@ -20,6 +20,7 @@ const checkProp = (predicate, prop) => obj => !!predicate(obj[prop]);
 
 
 
+
 const lengthIs4 = checkProp(l => l === 4, 'length');
 lengthIs4([]); // false
 lengthIs4([1,2,3,4]); // true
diff --git a/test/_30s.js b/test/_30s.js
index 4151e82bd..2c0a2ba21 100644
--- a/test/_30s.js
+++ b/test/_30s.js
@@ -205,6 +205,7 @@ 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/vscode_snippets/snippets.json b/vscode_snippets/snippets.json
index 103e9be86..6f634e58e 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]",
       "  }",
       "});"
     ],