Test Solutions

test/clone-object.js

@@ -2,6 +2,8 @@ describe('clone object', function () {
   it('should clone an object', function () {
     var expected = {name: 'Ahmed', age: 27, skills: ['cycling', 'walking', 'eating']},
         obj = {};
+      // simple one liner to deep clone an object, (regarded to be the fastest method for deep cloning objects?)
+        obj = JSON.parse(JSON.stringify(expected));
 
     expect(obj).toEqual(expected);
     expect(obj).not.toBe(expected);

test/flatten-array.js

@@ -1,8 +1,14 @@
 describe('flatten array', function () {
   it('should flatten an array', function () {
-    var arr = [1, 2, [1, 2, [3, 4, 5, [1]]], 2, [2]],
-        expected = [1, 1, 1, 2, 2, 2, 2, 3, 4, 5];
+    var arr = [1, 2, [1, 2, [3, 4, 5, [1]]], 2, [2]];
+    var expected = [1, 1, 1, 2, 2, 2, 2, 3, 4, 5];
 
+  //enabling deep level flatten use recursion using reduce and concat methods
+     function flatten(arr) {
+       return arr.reduce(function (flat, val) => Array.isArray(val) ? flat.concat(flatten(val)) : flat.concat(val), []);
+     }
+     //sorting out an array in ascending order
+     arr = flatten(arr).sort();
     expect(arr).toEqual(expected);
   });
-});
+});

test/scoping.js

@@ -15,10 +15,11 @@ describe('scoping', function () {
       return this.foo;
     };
 
+//using the bind method to call a function with the 'this' value set explicitly
     Module.prototype.req = function() {
-      return request(this.method);
+      return request(this.method.bind(this));
     };
 
     expect(mod.req()).toBe('bar');
   });
-});
+});