Add arguments coding question

Author: sudheerj

README.md

@@ -11762,6 +11762,35 @@ console.log(arr.sort(Intl.Collator().compare)); //['Wann', 'wäre', 'Woche', 'w
 </details>
 
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+
+
+#### 85. What is the output of below code?
+
+```javascript
+function func(a, b=2) {
+  console.log(arguments.length);
+}
+
+func(undefined);
+func();
+```
+
+- 1: 1, 0
+- 2: 0, 0
+- 3: 0, 1
+- 4: 1, 1
+
+<details><summary><b>Answer</b></summary>
+<p>
+
+##### Answer: 1
+
+If a function is called with `undefined`, the `undefined` value is treated as a parameter. But if the function is not passed with any parameters, the `arguments` object doesn't include any argument eventhough the function has default function parameter. Hence, the function invocation with `undefined` has one argument and function call without any arguments has 0 agruments.
+
+</p>
+</details>
+
+**[⬆ Back to Top](#table-of-contents)**
  
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