Complete The Pattern #1 Task: You have to write a function pattern which creates the following pattern upto n number of rows. If the Argument is 0 or a Negative Integer then it should return "" Pattern: 1 22 333 .... ..... nnnnnn Note: There are…

Complete The Pattern #2 Description: Task: You have to write a function pattern which creates the following pattern upto n number of rows. If the Argument is 0 or a Negative Integer then it should return "" i.e. empty string. Pattern: (n)(n-1)(n…

Complete The Pattern #6 - Odd Ladder Task: You have to write a function pattern which creates the following pattern (see examples) up to the desired number of rows. If the Argument is 0 or a Negative Integer then it should return "" i.e. empty s…

默认是在一个fragment中实现RecyclerView. private inner class CrimeAdapter() : ListAdapter<Crime, CrimeHolder>(mDiffCallback) { override fun onCreateViewHolder( parent: ViewGroup, viewType: Int ): CrimeHolder {//这个parent就是RecyclerView;在这个方法中绑定子项视图 val view = l…

Use an append-only store to record the full series of events that describe actions taken on data in a domain, rather than storing just the current state, so that the store can be used to materialize the domain objects. This pattern can simplify tasks…

Consolidate multiple tasks or operations into a single computational unit. This pattern can increase compute resource utilization, and reduce the costs and management overhead associated with performing compute processing in cloud-hosted applications…

Enable multiple concurrent consumers to process messages received on the same messaging channel. This pattern enables a system to process multiple messages concurrently to optimize throughput, to improve scalability and availability, and to balance t…

Undo the work performed by a series of steps, which together define an eventually consistent operation, if one or more of the steps fail. Operations that follow the eventual consistency model are commonly found in cloud-hosted applications that imple…

Handle faults that may take a variable amount of time to rectify when connecting to a remote service or resource. This pattern can improve the stability and resiliency of an application.在连接到一个远程服务或资源时,处理故障可能需要一个变量的时间来纠正.这种模式可以提高应用程序的稳定性和弹性. Context a…

Bridge Pattern, Composite Pattern, Decorator Pattern, Facade Pattern, COR Pattern, Proxy Pattern, template Pattern, MVC. Updated with the explanation of Composite pattern, Decorator Pattern and Template Pattern. Design Pattern Interview Question - Pa…

Interpeter , Iterator , Mediator , Memento and Observer design patterns. (I) what is Interpreter pattern? (B) Can you explain iterator pattern? (A) Can you explain mediator pattern? (I) Can you explain memento pattern? (B) Can you explain observer pa…

State, Stratergy, Visitor Adapter and fly weight design pattern from interview perspective. (I) Can you explain state pattern? (I) Can you explain strategy pattern? (A) Can you explain visitor pattern? (A) What the difference between visitor and stra…

Factory, Abstract factory, prototype pattern (B) What are design patterns? (A) Can you explain factory pattern? (I) Can you explain abstract factory pattern? (I)Can you explain builder pattern? (I) Can you explain prototype pattern? (A) Can you expla…

from: Working with Scala's XML Support 虽然这个guy炒鸡罗嗦,但是还是讲到我要的那句话:  Because Scala doesn't support XML patterns with attributes. scala的模式匹配模式根本就不支持 属性 还是老老实实用XPath吧 XML is probably one of Scala's most controversial language features (right behind unrest…

2010-03-12 JavaScript Module Pattern: In-Depth The module pattern is a common JavaScript coding pattern. It’s generally well understood, but there are a number of advanced uses that have not gotten a lot of attention. In this article, I’ll review the…

1. Brief 一直对Observer Pattern和Pub/Sub Pattern有所混淆,下面打算通过这两篇Blog来梳理这两种模式.若有纰漏请大家指正. 2. Role Publisher:消息发布者,组装原始消息实体并触发消息传递的主体. Subscriber:消息订阅者,接收消息实体并作出响应的主体. Message Broker or Event Bus:消息发布者 与 消息订阅者 间的媒介,内含消息过滤和消息路由的功能,并可通过内置的消息队列(message queue)现实优…

https://msdn.microsoft.com/zh-cn/library/wewwczdw(v=vs.110).aspx Applications that perform many tasks simultaneously, yet remain responsive to user interaction, often require a design that uses multiple threads. 同时执行多项任务,并且仍要相应用户交互的应用,通常需要一个使用多线程的设计.…

The Task-based Asynchronous Pattern (TAP) is based on the System.Threading.Tasks.Task and System.Threading.Tasks.Task<TResult> types in the System.Threading.Tasks namespace, which are used to represent arbitrary asynchronous operations. TAP is the r…

The Module Pattern Modules Modules are an integral piece of any robust application's architecture and typically help in keeping the units of code for a project both cleanly separated and organized. In JavaScript, there are several options for impleme…

Event Sourcing pattern Instead of storing just the current state of the data in a domain, use an append-only store to record the full series of actions taken on that data.The store acts as the system of record and can be used to materialize the domai…

使用Selenium的framework,大家免不了要使用他的page object pattern来开发适合自己的framework,原因很简单,page object 可以将测试的对象抽象成一个个的class 类,每个页面对应一个page的class.这个有点类似于QTP的对象库,所以使用它的好处显而易见.一个好的framework是可以节省很多的coding的.所以你在使用page object的时候可以先写一个基础的page object的类,然后其他的任何的page都继承这个类,这样的…

Microservice Architecture pattern http://microservices.io/patterns/microservices.html Context You are developing a server-side enterprise application. It must support a variety of different clients including desktop browsers, mobile browsers and nati…

https://docs.microsoft.com/zh-cn/dotnet/api/system.web.ui.page.ispostback?view=netframework-4.7 https://docs.microsoft.com/zh-cn/dotnet/api/system.web.ui.usercontrol.ispostback?view=netframework-4.7.1 Understanding The Complete Story of Postback in A…

The pattern language is organized into four design spaces.  Generally one starts at the top in the Finding Concurrency design space and works down through the other design spaces in order until a detailed design for a parallel program is obtained. Cl…

A Pattern Language for Parallel Application Programming Berna L. Massingill, Timothy G. Mattson, Beverly A. Sanders Abstract Parallel computing has failed to attract significant numbers of programmers outside the specialized world of supercomputing.…

晚上刷起来. <?php /* The memento pattern provides the object restore functionality. Implementation is done through three different objects; originator, caretaker, and a memento, where the originator is the one preserving the internal state required for a…

Laravel Repository Pattern   The Repository Pattern can be very helpful to you in order to keep your code a little cleaner and more readable. In fact, you don’t have to be using Laravel in order to use this particular design pattern. For this episode…

Preface Pattern recognition has its origins in engineering, whereas machine learning grew out of computer science. However, these activities can be viewed as two facets of the same field, and together they have undergone substantial development over t…

我们发现这张Gary.csv表格存在学生成绩不完全的(五十三名学生,三名学生存在成绩不完整.共四个不完整成绩) 79号大学语文.高等数学 96号中国近代史纲要 65号大学体育 (1)NA表示数据集中的该数据遗失.不存在.在针对具有NA的数据集进行函数操作的时候,该NA不会被直接剔除.如x<-c(1,2,3,NA,4),取mean(x),则结果为NA,如果想去除NA的影响,需要显式告知mean方法,如 mean(x,na.rm=T):NA是没有自己的mode的,在vector中,它会“追随”其他数…

在前一篇文章中,我们已经对Enterprise Integration Pattern中所包含的各个组成进行了简单地介绍.限于篇幅(20页Word以内),我并没有深入地讨论各个组成.但是如果要真正地按照Enterprise Integration Pattern搭建一个系统,仅仅是了解它们实际上还差得很远.因此在本文中,我将会对Enterprise Integration Pattern中较容易产生混淆的部分以及一些系统搭建时常常使用的一些方法进行介绍. 寻找最优的解决方案 相信您在读前一篇文章…