update: added k smallest elements problem

Author: ashokdey

src/_Problems_/k-smallest-elements-in-array/index.js

@@ -0,0 +1,21 @@
+/**
+ * Find 4 smallest elements in an array
+ */
+
+const MinHeap = require('../../_DataStructures_/Heaps/MinHeap');
+
+function findKSmallest(collection, k) {
+  if (!collection || !Array.isArray(collection)) {
+    throw new Error('Invalid / missing collection');
+  }
+
+  // create a MinHeap using the collection
+  const mh = new MinHeap(collection);
+  const result = [];
+  for (let i = 0; i < k; i += 1) {
+    result.push(mh.getMin());
+  }
+  return result;
+}
+
+module.exports = findKSmallest;