add chunk-array.md

snippets/chunk-array.md

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+### Chunk Array
+
+Creates an array of elements split into groups the length of size. 
+If array can't be split evenly, the final chunk will be the remaining elements.
+
+```js
+const chunk = (arr, size) => 
+  Array
+    .apply(null, {length: Math.ceil(arr.length/size) })
+    .map((value, index) => arr.slice(index*size, index*size+size) )
+
+// const myArray = [2, 2, 2, 2, 2, 2, 3, 2, 3, 2, 3, 2, 2];
+// chunk(myArray, 3) -> [ [ 2, 2, 2 ], [ 2, 2, 2 ], [ 3, 2, 3 ], [ 2, 3, 2 ], [ 2 ] ]
+```