Category: JavaScript

Initialize instance state in constructor methods.

Extend classes with extends and super.

Hide internals with closures or #private fields.

Call the same method name across different types with different behavior.

Understand [[Prototype]] lookup and Object.create.

Learn the Document Object Model as a tree of nodes.

Learn how this is set by call site (rules differ for arrows).

Set this explicitly with call, apply, and bind.

Model domains with objects/classes while knowing prototypes underneath.

Define classes and construct instances with new.