Merge pull request #315 from myapos/reducedFilter

[FEATURE] reduced Filter

snippets/reducedFilter.md

@@ -0,0 +1,33 @@
+### reducedFilter
+
+Filter an array of objects based on a condition while also filtering out unspecified keys.
+
+Use `Array.filter()` to filter the array based on the predicate `fn` so that it returns the objects for which the condition returned a truthy value. 
+On the filtered array, use `Array.map()` to return the new object using `Array.reduce()` to filter out the keys which were not supplied as the `keys` argument.
+
+```js
+const reducedFilter = (data, keys, fn) =>
+  data.filter(fn).map(el =>
+    keys.reduce((acc, key) => {
+      acc[key] = el[key];
+      return acc;
+    }, {})
+  );
+```
+
+```js
+const data = [
+  {
+    id: 1,
+    name: 'john',
+    age: 24
+  },
+  {
+    id: 2,
+    name: 'mike',
+    age: 50
+  }
+];
+
+reducedFilter(data, ['id', 'name'], item => item.age > 24); // [{ id: 2, name: 'mike'}]
+```