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744What Classes Are: Syntactic Sugar Over Prototypes
745Declaring a Class with the class Keyword
746Class Expressions: Named and Anonymous
747The Constructor Method
748Instance Properties: Where They Live
749Instance Methods: Defined on the Prototype
750The new Keyword with Classes
751Class Declarations Are Not Hoisted
752Strict Mode Is Always Enabled in Classes
753The typeof Operator on Classes
754Classes Cannot Be Called Without new
755Comparing Class Syntax to Constructor Functions
756When to Use Class Declarations vs Expressions
757The Constructor Method
758Constructor Parameters
759Instance Properties in Constructors
760Default Parameter Values in Constructors
761Instance Methods
762Method Shorthand Syntax
763Accessing Instance Properties in Methods
764Methods Calling Other Methods
765Constructor Validation
766Return Values from Constructors
767Constructor Without Parameters
768Method Binding and Context
769Class Inheritance with extends
770The super() Constructor Call
771super() Must Come First
772Inheriting Methods from the Parent
773Overriding Parent Methods
774Calling Parent Methods with super
775The Prototype Chain with Extends
776Extending Built-in Classes
777super in Static Methods
778Constructor Parameters and super()
779When to Use Inheritance vs Composition
780What Are Static Methods?
781Declaring Static Methods
782Accessing Static Methods
783Static Methods Cannot Access Instance Properties
784Common Use Cases for Static Methods
785Static Properties
786Declaring Static Properties
787Static Initialization Blocks
788Inheritance of Static Members
789Static vs Instance: When to Use Each
790Private Fields with # Syntax
791Private Methods
792Private Static Fields
793Private Static Methods
794Accessing Private Fields in Methods
795Private Fields and Inheritance
796Class Static Initialization Blocks
797Use Cases for Static Blocks
798Private Fields vs WeakMap Pattern

744What Classes Are: Syntactic Sugar Over Prototypes
745Declaring a Class with the class Keyword
746Class Expressions: Named and Anonymous
747The Constructor Method
748Instance Properties: Where They Live
749Instance Methods: Defined on the Prototype
750The new Keyword with Classes
751Class Declarations Are Not Hoisted
752Strict Mode Is Always Enabled in Classes
753The typeof Operator on Classes
754Classes Cannot Be Called Without new
755Comparing Class Syntax to Constructor Functions
756When to Use Class Declarations vs Expressions
757The Constructor Method
758Constructor Parameters
759Instance Properties in Constructors
760Default Parameter Values in Constructors
761Instance Methods
762Method Shorthand Syntax
763Accessing Instance Properties in Methods
764Methods Calling Other Methods
765Constructor Validation
766Return Values from Constructors
767Constructor Without Parameters
768Method Binding and Context
769Class Inheritance with extends
770The super() Constructor Call
771super() Must Come First
772Inheriting Methods from the Parent
773Overriding Parent Methods
774Calling Parent Methods with super
775The Prototype Chain with Extends
776Extending Built-in Classes
777super in Static Methods
778Constructor Parameters and super()
779When to Use Inheritance vs Composition
780What Are Static Methods?
781Declaring Static Methods
782Accessing Static Methods
783Static Methods Cannot Access Instance Properties
784Common Use Cases for Static Methods
785Static Properties
786Declaring Static Properties
787Static Initialization Blocks
788Inheritance of Static Members
789Static vs Instance: When to Use Each
790Private Fields with # Syntax
791Private Methods
792Private Static Fields
793Private Static Methods
794Accessing Private Fields in Methods
795Private Fields and Inheritance
796Class Static Initialization Blocks
797Use Cases for Static Blocks
798Private Fields vs WeakMap Pattern

Lesson 790 of 2,723·18. ClassesPro lesson

Private Fields with # Syntax

Learn how to declare truly private instance fields using the # prefix that cannot be accessed outside the class.

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