Merge pull request #87 from kingdavidmartins/add-pick-method

add pick code snippet

snippets/pick.md

@@ -0,0 +1,14 @@
+### Pick
+
+Use `.reduce()` to convert the filtered/picked keys back to a object with the corresponding key:value pair if the key exist in the obj.
+
+```js
+const pick = (obj, arr) => arr.reduce((acc, curr) => (curr in obj && (acc[curr] = obj[curr]), acc), {});
+
+// const object = { 'a': 1, 'b': '2', 'c': 3 };
+// pick(object, ['a', 'c']) -> { 'a': 1, 'c': 3 }
+
+// pick(object, ['a', 'c'])['a'] -> 1
+// pick(object, ['a', 'c'])['c'] -> 3
+
+```