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A learning journey based on design patterns
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Observer
Mode
1,
Initial observer Mode
In a time when the network was not so developed, many people wanted to know that the weather forecast for the next day had to watch live TV at the specified time, but sometimes they wanted to watch the weather and found that live TV had passed. This is really an u
One of the several javaScript design patterns-the single mode and the javascript Design Pattern
JavaScript is a weak type, dynamic, prototype-based language. This language feature makes it very easy,
It is even common to implemen
, and the leaf node object gives real feedback on the message.In strategy mode 3, the context does not have the ability to execute the algorithm, but instead delegates this responsibility to a policy object. Each policy object is responsible for the algorithm that has been encapsulated inside the object. When we issue a "computed" message to these policy objects, they return their respective computed results.1. See chapter 9th, "Command mode", 2. See chapter 10th, "Combination mode" 3. See chapt
, and the leaf node object gives real feedback on the message.In strategy mode 3, the context does not have the ability to execute the algorithm, but instead delegates this responsibility to a policy object. Each policy object is responsible for the algorithm that has been encapsulated inside the object. When we issue a "computed" message to these policy objects, they return their respective computed results.1. See chapter 9th, "Command mode" 2. See chapter 10th, "Combinatorial Mode" 3. See chap
description of a UML diagram may not be clear about all the modes. For example, the agent mode and the Decorator Mode Share a UMLImages, but they are essentially different. This is one of the key concepts of our learning model. This is why and when a specific situation shouldApplied.
Naming is also very important. Many people call the code that creates some things as a factory. However, not every creator is a factory.The correct message actually has
JavaScript design patterns and development practices-JavaScript Polymorphism
"Polymorphism" is derived from polymorphism in the Greek text. The split is poly (plural) + morph (morphology) + ism, which can be literally understood as the plural form.
The actual meaning of polymorphism is: the same operation acts on diffe
In the work need some front-end JS code, but write relatively simple, usually is the function, and then see the code, but still can not be very good to write a clearer code, recently in the Web front end of the communication group download some of the design mode of video, after reading hope to tidy up a bit, The design pattern of code to organize out, easy to exchange
This article mainly introduces the factory mode and constructor mode of the JavaScript design mode. It also describes the categories of the design mode, such as the creation mode, structure mode, and Behavior Design mode, for more information, see
What is mode?
A while ago, I was preparing for the final exam. I am so
how to simulate the implementation of object-oriented programming through functional programming. We will discuss why you should put the design pattern on the homepage and how to use it to make your code more effective and work easier.
Flexible JavaScriptA very important feature of JavaScript is its flexibility. As a JavaScript programmer, you can make your prog
JavaScript is a popular and widely used language in recent years. Because it is supported by almost all browsers, it has also been widely promoted. As a language, it becomes incredibly important in our lives, helping us enhance web functions and create rich user interfaces.Why are there still some people who think it is a "Toy" language and think it is not suitable for professional programmers. I think this is because they didn't realize its true powe
prototype programming paradigm
If the object cannot respond to a request, it will delegate the request to its own prototype
object.prototype , which is an empty object, every object we encounter in JavaScript is actually cloned from it. object.prototype is their prototype. Although we often use new to instantiate a function, in JavaScript, when you use the new operat
engine does those things.
First, try traversing the properties in B, but not the Name property.
The request to find the name attribute is delegated to the prototype of the constructor of object B, which is b.__proto__ logged and points to B.prototype, and B. The prototype is set to an object created through new A ().
The name attribute is still not found in the object, and the request is continued to be delegated to the prototype A.prototype of the object constructor.
The N
original link:https://boostlog.io/@sonuton/23-javascript-design-patterns-5adb006847018500491f3f7fTurn from:https://mp.weixin.qq.com/s?__biz=MzUxMzcxMzE5Ng==mid=2247488996idx=1sn= c337e4cfe2a67550f5f22536d58a9735chksm= f951a0a7ce2629b13bb306f9a2410e2be8e9f6958756be40c36937371c4ff5dfef2b78bbbb19mpshare=1scene=23 Srcid=060272xasmjgvam6eohoezw7#rdAuthor |sonutonThe t
system.Behavioral patterns include: iteration mode, Mediator mode, observer pattern, and visitor pattern.Below, we will deepen our understanding of design patterns by introducing each of the common design patterns separately.Constructor modeA constructor is a special functi
A deep understanding of the JavaScript series (27): The Builder mode of design patterns, and a deep understanding of javascriptIntroduction
In a software system, sometimes it is faced with the creation of "a complex object", which is usually composed of sub-objects of each part using a certain algorithm; due to changes in requirements, the various parts of this c
"Patchwork" and call similar to building blocks, some people even advocate "blue-collar programmers", which are not familiar with modern programming technologies.
In truly reusable object-oriented programming, gof's Design Pattern provides us with a set of reusable Object-oriented technologies, coupled with refactoring ), therefore, there are few simple repetitive tasks, and Java code refinement and object-oriented purity (the
This article mainly introduces a deep understanding of the JavaScript series (27): a detailed explanation of the builder mode of design patterns. The Builder mode can separate the construction of a complex object from its representation, this allows you to create different representations for the same build process. For more information, see
Introduction
In a so
Deep understanding of the JavaScript series (28): factory mode of design patterns, deep understanding of javascriptIntroduction
Similar to the creation mode, when creating an object in the factory mode (as a product in the factory), you do not need to specify a specific class for creating the object.
The factory mode defines an interface for creating objects. The
"Patchwork" and call similar to building blocks, some people even advocate "blue-collar programmers", which are not familiar with modern programming technologies.
In truly reusable object-oriented programming, gof's Design Pattern provides us with a set of reusable Object-oriented technologies, coupled with refactoring ), therefore, there are few simple repetitive tasks, and Java code refinement and object-oriented purity (the
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