Data Structures: Use .has and .size on an ES6 Set

Data Structures/es6SetHasAndSize.js

@@ -0,0 +1,8 @@
+// https://www.freecodecamp.org/learn/coding-interview-prep/data-structures/use--has-and--size-on-an-es6-set
+
+function checkSet(arrToBeSet, checkValue) {
+  // Only change code below this line
+  const set = new Set(arrToBeSet);
+  return [set.has(checkValue), set.size];
+  // Only change code above this line
+}