typescript: Prototype Pattern

 

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/**
 *file: prototypets.ts
 * Prototype Pattern 原型是一种创建型设计模式， 使你能够复制对象， 甚至是复杂对象， 而又无需使代码依赖它们所属的类。
 * The example class that has cloning ability. We'll see how the values of field
 * with different types will be cloned.
 */
class Prototype {
 
    public primitive: any;
    public ducomponent: object;
    public circularReference: ComponentWithBackReference;
 
    public clone(): this {
        const clone = Object.create(this);
 
        clone.component = Object.create(this.ducomponent);
 
        // Cloning an object that has a nested object with backreference
        // requires special treatment. After the cloning is completed, the
        // nested object should point to the cloned object, instead of the
        // original object. Spread operator can be handy for this case.
        clone.circularReference = {
            ...this.circularReference,
            prototype: { ...this },
        };
 
        return clone;
    }
}
/**
 *
 */
class ComponentWithBackReference {
    public prototype;
 
    constructor(prototype: Prototype) {
        this.prototype = prototype;
    }
}
 
/**
 * The client code.
 */
function clientCodeproto() {
    const p1 = new Prototype();
    p1.primitive = 245;
    p1.ducomponent = new Date();
    p1.circularReference = new ComponentWithBackReference(p1);
    let str="";
    const p2 = p1.clone();
    //
    if (p1.primitive == p2.primitive) {
        console.log('Primitive field values have been carried over to a clone. Yay!');
        str=str+"Primitive ;";
         
    } else {
        console.log('Primitive field values have not been copied. Booo!');
        str=str+"not been copied;";
        
    }
    //
    if (p1.ducomponent == p2.ducomponent) {
        console.log('Simple component has not been cloned. Booo!');
        str=str+"Simple component not been cloned;";
        
    } else {
        console.log('Simple component has been cloned. Yay!');
        str=str+"Simple component;";
         
    }
    //
    if (p1.circularReference == p2.circularReference) {
        console.log('Component with back reference has not been cloned. Booo!');
        str=str+"Component not been cloned;";
    } else {
        console.log('Component with back reference has been cloned. Yay!');
        str=str+"Component been cloned;";
    }
    //
    if (p1.circularReference.prototype == p2.circularReference.prototype) {
        console.log('Component with back reference is linked to original object. Booo!');
        str=str+"Component to original object;";
    } else {
        console.log('Component with back reference is linked to the clone. Yay!');
        str=str+" Component to the clone;";
    }
    return str;
}
 
let strpro=clientCodeproto();
let strpro1="geovindu";
let messageprototype: string = 'Hello World,This is a typescript!,涂聚文 Geovin Du Web';
document.body.innerHTML = messageprototype+","+strpro+","+strpro1+",TypeScript 原型方法模式"

　　

 

调用：

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<!doctype html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport"
        content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <head><title>TypeScript:原型模式Prototype Pattern</title>
      <meta name="Description" content="geovindu,涂聚文,Geovin Du"/>
<meta name="Keywords" content="geovindu,涂聚文,Geovin Du"/>
<meta name="author" content="geovindu,涂聚文,Geovin Du"/> 
    </head>
    <body>
        <script src="dist/prototypets.js"></script>
    </body>
</html>

　　

输出：

 

https://www.typescriptlang.org/docs/handbook/modules.html
https://www.typescriptlang.org/docs/handbook/classes.html
https://www.koderhq.com/tutorial/typescript/get-set/
https://dev.to/jmalvarez/builder-pattern-in-typescript-3on0
https://github.com/josemiguel-alvarez/design-patterns-typescript/
https://www.sourcecodeexamples.net/2020/08/typescript-prototype-pattern-example.html
https://www.tutorialspoint.com/typescript/typescript_object_prototype.htm
https://sbcode.net/typescript/prototype/
https://dev.to/takaakit/uml-diagram-for-gof-design-pattern-examples-in-typescript-46d5
https://www.dofactory.com/javascript/design-patterns/prototype

 

posted @   ®Geovin Du Dream Park™  阅读(12)  评论(0)  编辑  收藏  举报
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