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  • Prototypal inheritance

    Prototypal inheritance

    For instance, we have a user object with its properties and methods, and want to make admin and guest as slightly modified variants of it. We’d like to reuse what we have in user, not copy/reimplement its methods, just build a new object on top of it.
    2024-12-19
  • Prototype methods, objects without __proto__

    Prototype methods, objects without __proto__

    In the first chapter of this section, we mentioned that there are modern methods to setup a prototype.
    2024-12-18
  • F.prototype

    F.prototype

    Remember, new objects can be created with a constructor function, like new F().
    2024-12-18
  • Native prototypes

    Native prototypes

    The "prototype" property is widely used by the core of JavaScript itself. All built-in constructor functions use it.
    2024-12-18
  • Class basic syntax

    Class basic syntax

    In object-oriented programming, a class is an extensible program-code-template for creating objects, providing initial values for state (member variables) and implementations of behavior (member functions or methods).
    2024-12-18
  • Class inheritance

    Class inheritance

    Class inheritance is a way for one class to extend another class.
    2024-12-18
  • Static properties and methods

    Static properties and methods

    We can also assign a method to the class as a whole. Such methods are called static.
    2024-12-17
  • Private and protected properties and methods

    Private and protected properties and methods

    One of the most important principles of object oriented programming – delimiting
    2024-12-17
  • Extending built-in classes

    Extending built-in classes

    Built-in classes like Array, Map and others are extendable also. For instance, h
    2024-12-17
  • Class checking: "instanceof"

    Class checking: "instanceof"

    The instanceof operator allows to check whether an object belongs to a certain class. It also takes inheritance into account.
    2024-12-17
  • Mixins

    Mixins

    In JavaScript we can only inherit from a single object. There can be only one [[Prototype]] for an object. And a class may extend only one other class.
    2024-12-17
  • Error handling, "try...catch"

    Error handling, "try...catch"

    No matter how great we are at programming, sometimes our scripts have errors. They may occur because of our mistakes, an unexpected user input, an erroneous server response, and for a thousand other reasons.
    2024-12-16
  • Custom errors, extending Error

    Custom errors, extending Error

    When we develop something, we often need our own error classes to reflect specific things that may go wrong in our tasks. For errors in network operations we may need HttpError, for database operations DbError, for searching operations
    2024-12-16
  • Introduction: callbacks

    Introduction: callbacks

    We use browser methods in examples hereTo demonstrate the use of callbacks, prom
    2024-12-16
  • Unicode, String internals

    Unicode, String internals

    Advanced knowledgeThe section goes deeper into string internals. This knowledge
    2024-12-16
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