Merge pull request #17 from moinuddin14/master

Update 03_default_function_arguments.md

Author: AlbertoMontalesi

ebook/03_default_function_arguments.md

@@ -88,6 +88,10 @@ const bill = calculatePrice({ tip: 0.15, total:150 });
 // 187.5
 ```
 
+const bill = calculatePrice({ tip: 0.15, total:150 });
+// 187.5
+```
+
 We made the argument of our function an Object and when calling the function we don't even have to worry about the order of the parameters because they will be matched based on their key.
 
 In the example above the default value for *tip* was 0.05 and we overwrote it with 0.15 but we didn't give a value to tax which remained the default 0.1.
@@ -121,3 +125,24 @@ calculatePrice(undefined)
 No matter what we passed, the argument was defaulted to an `Object` which had three default properties of total, tax and tip.
 
 Don't worry about destructuring, we will talk about it in Chapter 10.
+
+Note: We now don't need to construct object and equate to an empty object. Alternative to above we can construct a function as below
+
+``` javascript
+function calculatePrice({
+  total = 0,
+  tax = 0.1,
+  tip = 0.05}){
+  return total + (total * tax) + (total * tip);
+}```
+
+and the below code would work normal
+
+```js
+calculatePrice({});
+// 0
+calculatePrice();
+// 0
+calculatePrice(undefined)
+// 0
+```