Merge pull request #266 from benjibuiltit/object-keys

added object keys challenge

README.md

@@ -79,7 +79,6 @@ Code contributions welcome! Please check our [documentation on contributing](htt
 
 Add these challenges:
 
-- "OBJECT KEYS"
 - "FUNCTION RETURN VALUES"
 - "THIS"
 

menu.json

@@ -15,6 +15,7 @@
   "LOOPING THROUGH ARRAYS",
   "OBJECTS",
   "OBJECT PROPERTIES",
+  "OBJECT KEYS",
   "FUNCTIONS",
   "FUNCTION ARGUMENTS",
   "SCOPE"

problems/object-keys/problem.md

@@ -1,5 +1,44 @@
----
+JavaScript provides a native way of listing all the available keys of an object. This can be helpful for looping through all the properties of an object and manipulating their values accordingly.
 
-#
+Here's an example of listing all object keys using the **Object.keys()**
+prototype method.
 
----
+```js
+const car = {
+    make: 'Toyota',
+    model: 'Camry',
+    year: 2020
+};
+const keys = Object.keys(car);
+
+console.log(keys);
+```
+
+The above code will print an array of strings, where each string is a key in the car object. `['make', 'model', 'year']`
+
+## The challenge:
+
+Create a file named `object-keys.js`.
+
+In that file, define a variable named `car` like this:
+
+```js
+const car = {
+  make: 'Honda',
+  model: 'Accord',
+  year: 2020
+};
+```
+
+Then define another variable named `keys` like this:
+```js
+const keys = Object.keys(car);
+```
+
+Use `console.log()` to print the `keys` variable to the terminal.
+
+Check to see if your program is correct by running this command:
+
+```bash
+javascripting verify object-keys.js
+```

problems/object-keys/solution.md

@@ -1,5 +1,11 @@
 ---
 
-#
+# CORRECT.
+
+Good job using the Object.keys() prototype method. Remember to use it when you need to list the keys of an object.
+
+The next challenge is all about **functions**.
+
+Run `javascripting` in the console to choose the next challenge.
 
 ---

problems/object-properties/solution.md

@@ -4,7 +4,7 @@
 
 Good job accessing that property.
 
-The next challenge is all about **functions**.
+The next challenge is all about **object keys**.
 
 Run `javascripting` in the console to choose the next challenge.
 

solutions/object-keys/index.js

@@ -0,0 +1,8 @@
+const car = {
+    make: 'Toyota',
+    model: 'Camry',
+    year: 2020
+};
+const keys = Object.keys(car);
+
+console.log(keys);