feat/ null check

Author: nik-rev

14_contains/solution/contains-solution.js

@@ -4,7 +4,7 @@ const contains = function(obj, searchValue) {
   // NaN !== NaN, so we would usually have to do an explicit check with Math.isNaN to test for it. However, Array.prototype.includes handles that for us
   if (values.includes(searchValue)) return true;
 
-  const nestedObjects = values.filter((value) => typeof value === 'object');
+  const nestedObjects = values.filter((value) => typeof value === 'object' && value !== null);
   for (const nestedObject of nestedObjects) {
     return contains(nestedObject, searchValue);
   }

14_contains/solution/contains-solution.spec.js

@@ -7,6 +7,7 @@ describe('contains', () => {
       info: {
           duplicate: 'e',
           magicNumber: 44,
+          empty: null,
           stuff: {
               thing: {
                 banana: NaN,
@@ -47,4 +48,8 @@ describe('contains', () => {
   test('true if NaN is a value within the object', () => {
     expect(contains(object, NaN)).toBe(true);
   });
+
+  test('false if the provided value exists and is null', () => {
+    expect(contains(object, null)).toBe(true);
+  });
 });