Objects & Classes

What you'll learn

• Objects in depth — literals, access patterns, spread, and deletion
• Prototypes and how property lookup walks the chain
• What the class keyword actually compiles to under the hood
• Inheritance with extends and super, and when to compose instead
• Private fields with #, and why _underscore was never enough
• How this binds inside methods — and how to keep it from getting lost
• Checking types and copying objects shallow vs deep

1. 01
   Object basics

   A bag of named values. Literals, dot vs bracket, shorthand, spread, deletion.
   14 min
2. 02
   Property descriptors

   Every property has hidden metadata. Getters, setters, and why const doesn't freeze.
   16 min
3. 03
   The prototype chain

   How property lookup walks one object to the next. The link that powers everything.
   17 min
4. 04
   Classes

   What class actually desugars to. Constructors, methods, and static.
   16 min
5. 05
   Inheritance

   Extends, super, and the is-a vs has-a check that saves you from bad hierarchies.
   16 min
6. 06
   Private and protected

   The # field, the closure trick, and why underscore was always a polite fiction.
   14 min
7. 07
   this in classes

   Lost this in callbacks, the React class-component pain, and the arrow-field fix.
   15 min
8. 08
   Checking and copying

   instanceof, Object.keys, spread, and structuredClone — picking the right tool.
   17 min