Updated description and added callback parameters

Update js-Array-prototype-filter.md
FreeCodeCamp · 4927eae309884d4850405a0370ee566e4bd579da · MatForsberg committed Feb 8, 2016 · Feb 8, 2016 · 4927eae
1 parent 01f59c7
commit 4927eae309884d4850405a0370ee566e4bd579da
Unified Split

Showing with 16 additions and 8 deletions.

+16 −8 js-Array-prototype-filter.md
@@ -6,18 +6,26 @@ The `filter()` method creates a new array with all elements that pass the test i
 arr.filter(callback[, thisArg])
 ```
 
-## parameters
+## filter() Parameters
 
-|          | Parameter                           |
-|----------|-------------------------------------|
-| Required | Arr                                 |
-| Required | callback (function with max 3 args) |
-| Optional | thisArg                             |
+|          | Parameter | Description                                       |
+|----------|-----------|---------------------------------------------------|
+| Required | arr       | Array being filtered                              |
+| Required | callback  | Function with 3 arguments (element, index, array) |
+| Optional | thisArg   | Value of *this* while executing callback          |
 
-**Return:** A new array that contains all the values for which the callback function returns true. If the callback function returns false for all elements of array1, the length of the new array is 0.
+**Return:** A new array that contains all the values for which the callback function returns true. If the callback function returns false for all elements of arr, the length of the new array is 0.
 
 [MDN link](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter) | [MSDN link](https://msdn.microsoft.com/library/ff679973%28v=vs.94%29.aspx?f=255&MSPPError=-2147217396)
 
+## Callback Parameters
+
+|          | Parameter | Description                                       |
+|----------|-----------|---------------------------------------------------|
+| Optional | element   | current element of array being filtered           |
+| Optional | index     | current index of array being filtered             |
+| Optional | array     | current array being filtered                      |
+
 ## Examples
 ```js
 // Define a callback function.
@@ -56,4 +64,4 @@ var result = arr.filter(
 
 document.write(result);
 // Output: element, the
-```
+```