Classes in javascript, A web development tutorial:
Classes:
The core of most classes is its architect, who sets the initial state of each instance and handles it for anyone.
Parameters that were passed when making a new call.
This is explained in the class block as if you are describing a method called a constructor, even though it is actually handled.
As a special case
Class Michaella's {
Builder (option) {
Create using the console.log (for example option) option.
this.option = option;
}
}
Example usage:
const foo = new MyClass ('Speedy'); // logs: "Creating an instance using the fast option"
One small thing to note is that the class builder cannot be made static by the word static, as described below.
For other methods.
Class inheritance:
Inheritance works just like it does in other object-oriented languages: The methods described on the superclass are:
An expandable subcategory is accessible.
If the subclass declares its constructor, then it must first use the parent constructor with super ().
Access it.
Class super class {
Constructor () {
this.logger = console.log;
}
Log () {
this.logger (`hi $ {this.name}`);
}
}
Extensions in the class subclass {
Constructor () {
Super ();
this.name = 'subclass';
}
}
const subClass = new SubClass ();
subClass.log (); // logs: "Hello subclass"
Static methods:
Static methods and properties are appreciated on the class/constructor itself, not on the instance object. They are specific
In class definitions using static keywords.
Class MyClass {
Static myStaticMethod () {
'Hello' back;
}
Static getMyStaticProperty () {
‘Goodbye’ back;
}
}
Console.log (MyClass.myStaticMethod ()); // logs: "hello"
Console.log (MyClass.myStaticProperty); // logs: "bye"
We can see that static properties are not appreciated for example objects.
const myClassInstance = new MyClass ();
Console.log (myClassInstance.myStaticProperty); // logs: unknown
However, they are defined in sub-segments.
Class MySubClass extends MyClass {s;
Console.log (MySubClass.myStaticMethod ()); // logs: "Hello"
Console.log (MySubClass.myStaticProperty);
Getters and Setters:
Getters and setters let you define custom behavior for reading and writing properties in your class. To do
Users, they look like a particular property. However, a custom function you provide internally is used
Determine when a property is accessed, and when necessary make any necessary changes.
Property is assigned.
In the definition of a class, the recipient writes a logic method such as Gate's word. A seater is like that,
Except if it accepts an argument (the new value is being assigned) and the set word will be used instead.
Class MyClass {
Constructor () {
this.names_ = [];
}
SetName (price) {
this.names_.push
(value);
}
GetName () {
Revert to this
name.
}
onst
myClassInstance = new MyClass ();
myClassInstance.name
= 'which';
myClassInstance.name
= 'Bob';
Console.log
(myClassInstance.name); // logs: "chapter"
Console.log
(myClassInstance.names_);
If you specify only
the setter, trying to access the property will always return an undefined one.
const classInstance
= new Class {
Prop. Cost {
Console.log
('setting', price);
}
};
classInstance.prop
= 10; // logs: "setting", 10
Console.log
(classInstance.prop);
class Queue {
constructor () {
const list = [];
this.enqueue = function (type) { list.push(type);
return type;
};
this.dequeue = function () {
return list.shift(); };
}
}
var q = Coca Cola; //
//
q.enqueue (9); // ... Availabe soda Now ...
q.enqueue (8); //
q.enqueue (7); //
//
Console.log (q.dequeue ()); // 9 ... it will be available for now the whole season.
Console.log (q.dequeue ()); // 8
Console.log (q.dequeue ()); // 7
Console.log (cue); // {}
Console.log (Object.KeyZ (q));
Constructor is closed with all types of construction in a row.
So alignment and marking of both its own line methods (see Object.kys (q)) still have access to the list.
Which resides in its enclosed scope which is protected during construction.
Imitation of private members through privileged public practices - using this style - should be kept in mind
That, with each instance, additional memory will be used for each of their own property procedures (as its code is
Cannot share / reuse). The same is true for the amount/size of the state it is going to store
Closure.
Methods:
Methods can be defined in classes to perform the function and optionally return the result.
They can receive arguments from the caller.
Class something {
Constructor (data) {
This data = data
}
Domsing (text) {
Returns {
Data: this data,
Text
}
}
}
var s = something new ({})
s.doSomething ("Hi") // Returns: {data: {}, text: "hi"}
The idea is to use WeakMap as a static map for the whole class so that each instance is kept as a key and
Private data as the key value of this example.
That way, within the class we will have access to the Wakemap Collection.
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