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Ilya Kantor 2018-02-06 13:07:22 +03:00
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@ -5,8 +5,6 @@ As we know, objects can store properties.
Till now, a property was a simple "key-value" pair to us. But an object property is actually more complex and tunable thing.
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## Property flags
Object properties, besides a **`value`**, have three special attributes (so-called "flags"):

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@ -7,8 +7,6 @@ The first kind is *data properties*. We already know how to work with them. Actu
The second type of properties is something new. It's *accessor properties*. They are essentially functions that work on getting and setting a value, but look like regular properties to an external code.
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## Getters and setters
Accessor properties are represented by "getter" and "setter" methods. In an object literal they are denoted by `get` and `set`:

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@ -6,8 +6,6 @@ For instance, we have a `user` object with its properties and methods, and want
*Prototypal inheritance* is a language feature that helps in that.
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## [[Prototype]]
In JavaScript, objects have a special hidden property `[[Prototype]]` (as named in the specification), that is either `null` or references another object. That object is called "a prototype":

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In modern JavaScript we can set a prototype using `__proto__`, as described in the previous article. But it wasn't like that all the time.
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JavaScript has had prototypal inheritance from the beginning. It was one of the core features of the language.
But in the old times, there was another (and the only) way to set it: to use a `"prototype"` property of the constructor function. And there are still many scripts that use it.

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@ -9,8 +9,6 @@ There are also other ways to get/set a prototype, besides those that we already
- [Object.getPrototypeOf(obj)](mdn:js/Object.getPrototypeOf) -- returns the `[[Prototype]]` of `obj`.
- [Object.setPrototypeOf(obj, proto)](mdn:js/Object.setPrototypeOf) -- sets the `[[Prototype]]` of `obj` to `proto`.
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For instance:
```js run

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@ -11,8 +11,6 @@ In JavaScript there are several well-known programming patterns to make classes
The `class` construct will be described in the next chapter, but in JavaScript it's a "syntax sugar" and an extension of one of the patterns that we'll study here.
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## Functional class pattern

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The "class" construct allows to define prototype-based classes with a clean, nice-looking syntax.
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## The "class" syntax
The `class` syntax is versatile, we'll start with a simple example first.

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@ -5,8 +5,6 @@ Classes can extend one another. There's a nice syntax, technically based on the
To inherit from another class, we should specify `"extends"` and the parent class before the brackets `{..}`.
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Here `Rabbit` inherits from `Animal`:
```js run

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@ -4,8 +4,6 @@ The `instanceof` operator allows to check whether an object belongs to a certain
Such a check may be necessary in many cases, here we'll use it for building a *polymorphic* function, the one that treats arguments differently depending on their type.
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## The instanceof operator [#ref-instanceof]
The syntax is: