Basic Data Structures (ex. 19 to 20)

+ Finished Basic Data Structures module

Author: hgonzaga

05-basic-data-structures/19-generate-an-array-of-all-object-keys-with-object-keys.js

@@ -0,0 +1,38 @@
+/*
+Generate an Array of All Object Keys with Object.keys():
+Finish writing the getArrayOfUsers function so that it returns an array containing all the properties in the object it
+receives as an argument.
+
+- The users object should only contain the keys Alan, Jeff, Sarah, and Ryan
+- The getArrayOfUsers function should return an array which contains all the keys in the users object
+*/
+let users = {
+    Alan: {
+        age: 27,
+        online: false
+    },
+    Jeff: {
+        age: 32,
+        online: true
+    },
+    Sarah: {
+        age: 48,
+        online: false
+    },
+    Ryan: {
+        age: 19,
+        online: true
+    }
+};
+
+function getArrayOfUsers(obj) {
+    // Only changed code below this line
+    let users = [];
+    for (let user in obj) {
+        users.push(user);
+    }
+    return users;
+    // Only changed code above this line
+}
+
+console.log(getArrayOfUsers(users));

05-basic-data-structures/20-modify-an-array-stored-in-an-object.js

@@ -0,0 +1,42 @@
+/*
+Modify an Array Stored in an Object:
+Take a look at the object we've provided in the code editor.
+The user object contains three keys. The data key contains five keys, one of which contains an array of friends.
+From this, you can see how flexible objects are as data structures. We've started writing a function addFriend.
+Finish writing it so that it takes a user object and adds the name of the friend argument to the array stored in
+user.data.friends and returns that array.
+
+- The user object should have name, age, and data keys.
+- The addFriend function should accept a user object and a friend string as arguments and add the friend to the array
+  of friends in the user object.
+- addFriend(user, "Pete") should return ["Sam", "Kira", "Tomo", "Pete"].
+ */
+let user = {
+    name: 'Kenneth',
+    age: 28,
+    data: {
+        username: 'kennethCodesAllDay',
+        joinDate: 'March 26, 2016',
+        organization: 'freeCodeCamp',
+        friends: [
+            'Sam',
+            'Kira',
+            'Tomo'
+        ],
+        location: {
+            city: 'San Francisco',
+            state: 'CA',
+            country: 'USA'
+        }
+    }
+};
+
+function addFriend(userObj, friend) {
+    // Only changed code below this line
+    const friends = [...userObj.data.friends, friend];
+    userObj.data.friends = friends;
+    return friends;
+    // Only changed code above this line
+}
+
+console.log(addFriend(user, 'Pete'));

05-basic-data-structures/README.md

@@ -8,26 +8,26 @@ freeCodeCamp module description:
 
 ### Exercises
 
-- [X] [ 01 - Use an Array to Store a Collection of Data]()
-- [X] [ 02 - Access an Array's Contents Using Bracket Notation]()
-- [X] [ 03 - Add Items to an Array with push() and unshift()]()
-- [X] [ 04 - Remove Items from an Array with pop() and shift()]()
-- [X] [ 05 - Remove Items Using splice()]()
-- [X] [ 06 - Add Items Using splice()]()
-- [X] [ 07 - Copy Array Items Using slice()]()
-- [X] [ 08 - Copy an Array with the Spread Operator]()
-- [X] [ 09 - Combine Arrays with the Spread Operator]()
-- [X] [ 10 - Check For The Presence of an Element With indexOf()]()
-- [X] [ 11 - Iterate Through All an Array's Items Using For Loops]()
-- [X] [ 12 - Create complex multi-dimensional arrays]()
-- [X] [ 13 - Add Key-Value Pairs to JavaScript Objects]()
-- [X] [ 14 - Modify an Object Nested Within an Object]()
-- [X] [ 15 - Access Property Names with Bracket Notation]()
-- [X] [ 16 - Use the delete Keyword to Remove Object Properties]()
-- [X] [ 17 - Check if an Object has a Property]()
-- [X] [ 18 - Iterate Through the Keys of an Object with a for...in Statement]()
-- [ ] [ 19 - Generate an Array of All Object Keys with Object.keys()]()
-- [ ] [ 20 - Modify an Array Stored in an Object]()
+- [X] [ 01 - Use an Array to Store a Collection of Data](01-use-an-array-to-store-a-collection-of-data.js)
+- [X] [ 02 - Access an Array's Contents Using Bracket Notation](02-access-an-arrays-contents-using-bracket-notation.js)
+- [X] [ 03 - Add Items to an Array with push() and unshift()](03-add-items-to-an-array-with-push-and-unshift.js)
+- [X] [ 04 - Remove Items from an Array with pop() and shift()](04-remove-items-from-an-array-with-pop-and-shift.js)
+- [X] [ 05 - Remove Items Using splice()](05-remove-items-using-splice.js)
+- [X] [ 06 - Add Items Using splice()](06-add-items-using-splice.js)
+- [X] [ 07 - Copy Array Items Using slice()](07-copy-array-items-using-slice.js)
+- [X] [ 08 - Copy an Array with the Spread Operator](08-copy-an-array-with-the-spread-operator.js)
+- [X] [ 09 - Combine Arrays with the Spread Operator](09-combine-arrays-with-the-spread-operator.js)
+- [X] [ 10 - Check For The Presence of an Element With indexOf()](10-check-for-the-presence-of-an-element-with-index-of.js)
+- [X] [ 11 - Iterate Through All an Array's Items Using For Loops](11-iterate-through-all-an-arrays-items-using-for-loops.js)
+- [X] [ 12 - Create complex multi-dimensional arrays](12-create-complex-multi-dimensional-arrays.js)
+- [X] [ 13 - Add Key-Value Pairs to JavaScript Objects](13-add-key-value-pairs-to-js-objects.js)
+- [X] [ 14 - Modify an Object Nested Within an Object](14-modify-an-object-nested-within-an-object.js)
+- [X] [ 15 - Access Property Names with Bracket Notation](15-access-property-names-with-bracket-notation.js)
+- [X] [ 16 - Use the delete Keyword to Remove Object Properties](16-use-the-delete-keyword-to-remove-object-properties.js)
+- [X] [ 17 - Check if an Object has a Property](17-check-if-an-object-has-a-property.js)
+- [X] [ 18 - Iterate Through the Keys of an Object with a for...in Statement](18-iterate-through-the-keys-of-an-object-with-a-for-in-statement.js)
+- [X] [ 19 - Generate an Array of All Object Keys with Object.keys()](19-generate-an-array-of-all-object-keys-with-object-keys.js)
+- [X] [ 20 - Modify an Array Stored in an Object](20-modify-an-array-stored-in-an-object.js)
 
 ⬅️ [Back to main file](../README.md)
 

README.md

@@ -13,7 +13,7 @@ freeCodeCamp course description:
 - [X] [ 02 - ES6](/02-es6/README.md)
 - [X] [ 03 - Regular Expressions](03-regular-expressions/README.md)
 - [X] [ 04 - Debugging](/04-debugging/README.md)
-- [ ] [ 05 - Basic Data Structures](/05-basic-data-structures/README.md)
+- [X] [ 05 - Basic Data Structures](/05-basic-data-structures/README.md)
 - [ ] [ 06 - Basic Algorithm Scripting]()
 - [ ] [ 07 - Object Oriented Programming]()
 - [ ] [ 08 - Functional Programming]()