How to code Arduino using Events | Actions | States

For Christmas, I signed myself up for the "Creative Engineering with Mark Rober". As part of the class we have to build something with an Arduino. Below is a link to my project. I created this video to help one of my peers in the class with their project.
I have post four videos for the project:
The Idea: • My Project for Creativ... ​
Progress: • My Project for Creativ... ​
Final Result: • Magical Alexa-Spotify-... ​ | • My Project for Creativ... ​
Link to the Creative Engineering with Mark Rober class:
monthly.com/mark-rober-engine...
This is my second RUclips Channel where I focus on software development. My other channel 'Maker At Play' is where i share my maker projects related to woodworking and electronics. / makeratplay
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[@AJayTheStageArtist]

Thank you so much for sharing ❤

[@makeratplaycoding2666]

Thanks for watching!

[@plumber919]

Great explanation of the code, events and actions. This helps with a project I’m currently working on. Thanks.

[@makeratplaycoding2666]

Glad it was helpful!

[@phaze0352]

Thanks for sharing! Do you have a full example of the code? The enum structure is perfect for a project I'm working on but I'm just trying to understand it a bit more.

[@makeratplaycoding2666]

Glad you found it helpful. Here is a link to the source code used in the video. www.dropbox.com/s/7524oa19769shrk/sketch_Unlock_Photo_and_Servo.ino?dl=0

[@TechMalaya]

enum class name MachineState. But is it true that's how to use enum ? I thought need to declare the object and call the variables .

[@makeratplaycoding2666]

In other programming languages they have the concept of the enum being an object with methods. But in C++ and my example code in the the video the enum is just a data type and not an object.