chunk method udpated

Author: me-shaon

README.md

@@ -168,7 +168,7 @@ Following API examples are shown based on the sample JSON data given [here](exam
 * [sortBy](#sortbyproperty-order)
 * [reset](#resetdata)
 * [copy](#copy)
-* [chunk](#chunk)
+* [chunk](#chunksize)
 
 ### `fetch()`
 
@@ -524,9 +524,11 @@ It will return a complete clone of the Object instance.
 
 See a detail example [here](examples/copy.js).
 
-### `chunk(size)`
+### `chunk(size, fn)`
 
 It will return a complete new array after chunking your array with specific size.
+If you want to transform each of the chunk based on any specific logic, pass a
+function containing that transformation as the second parameter of the `chunk()` method. 
 
 See a detail example [here](examples/chunk.js).
 
@@ -544,5 +546,5 @@ Speical thanks to [Nahid Bin Azhar](https://github.com/nahid) for the inspiratio
 
 ## Contributions
 
-If your PR is successfully merged to this project, feel free to add yourself in the list of contributors. 
+If your PR is successfully merged to this project, feel free to add yourself in the list of contributors.
 See all the [contributors](CONTRIBUTORS.md).

examples/chunk.js

@@ -13,3 +13,12 @@ const chunking = Q.from('users')
 
 console.log('-------- Printing Result of chunk ---------');
 console.log(chunking);
+
+Q = Q.reset();
+
+
+const transformedChunk = Q.from('users')
+ .where('location', '=', 'Barisal')
+ .chunk(4, (chunk) => {
+ return chunk.map((data) => {{ id: data.id}});
+ });

index.js

@@ -84,14 +84,14 @@ class JSJsonQ {
  * chunk - group the resulted collection to multiple chunk
  *
  * @param {integer} The length of each chunk
- * @return {Array} New Array 
+ * @param {fn} an anonymous function
+ * @return {Array} New Array
  */
-
- chunk(size = 0) {
+ chunk(size = 0, fn = null) {
  if(size <= 0) {
  throw Error('Invalid chunk size');
  }
- 
+
  this._prepare();
 
  let _newContent = [];
@@ -100,6 +100,12 @@ class JSJsonQ {
  _newContent.push(this._jsonContent.splice(0, size));
  }
 
+ if(fn instanceof Function) {
+ for(let i = 0; i < this._jsonContent.length; i++) {
+ _newContent[i] = fn(_newContent[i]);
+ }
+ }
+
  this._jsonContent = _newContent;
 
  return this._jsonContent;