Writing a web chat application with Vue:

Introduction: Vue.js is a progressive framework for building user interfaces. It is one of the most popular JavaScript frameworks to build user interfaces from the ground up in an incremental manner. The core library is a view-only framework and as such can be linked into web pages directly from a content data network. For example, if we want to build a webchat application, the following article will help us get started. 

 

Description:  A sample web page to be written in Vue could start with just the template, style, and script as shown in reference 1. All of this can be on the same web page but Vue provides excellent integration with many other frameworks so it is easy to package code in single file components that end with the .vue extension. These can then be combined into the main page with the help of component declaration and use. Each view file allows specifying a template, script, and style snippet. 

 

A vue instance consists of a root Vue instance and includes a tree of nested, reusable components when the application is well-organized. The instance created with a dictionary for data and methods which tells Vue’s reactivity system how to respond when the data changes from the user interface. There is a freezing method available that can prevent the existing properties from being changed but for the most part, a vue instance responds to the user’s directives. 

 

The state can be maintained to avoid re-rendering. This requires the use of a keep-alive directive surrounding the component Together with data, methods, and state, the vue instance can be successfully tested in all three forms: unit-testing, component testing and end-to-end testing.  

 

When we build a web-chat system, we simply define the template to comprise the component items we want to show. For example, a webchat system will be created with the help of vue-quick-chat. The look and feel of the web chat can be customized using the participants, messages, onType, onMessageSubmit, chatTitle, placeholder, colors, borderStyle, hideCloseButton and icon sizes. The onType and onMessageSubmit attributes allow the user experience to be customized and connected with any backend APIs.

The data and method handlers can be integrated with any backend system that parses the content of the messages. There is only one requestor and one responder, in this example, but the webchat user interface control can is independent of the backend system that behaves as the responder. It can even allow passive forwarding of messages between a group chat simply by making calls to a backend system. If the backend system is to be avoided to make the calls, the nodeJs can forward the message from one member to the other members of the group chat.

  

Conclusion: The framework provides incrementally adoptable components that can be mixed and matched to create a view and complex controls, logic, and workflow can be broken down and packaged into granular and reusable components. 

#codingexercises

find the largest square embeddable in a bar chart

import java.util.*;

class Solution {

    public int solution(int[] A) {

        int max = Integer.MIN_VALUE;

        for (int i = 0; i < A.length; i++) {

            for (int j = 0; j < A[i]; j++){

                int side = 1;

                for (int k = i + 1; k < A.length && k - i + 1 <= j + 1 && A[k] >= j+1; k++) {

                    side = k - i + 1;

                }

                if (side > max) {

                    max = side;

                }

            }

        }

        return max;

    }

}