Best Web Development Tech Stack For 2021- Front-end, Backend & Database

 

When it comes to developing a successful digital software, selection of the right tech stack plays a vital role. But, why? Developing a web solution is not just about designing a great UI and convenient UX, but it is also about designing a stable, secure and maintainable product that will scale your business. Here’s the right technology may help. If you are thinking to build a web solution then having a general understanding of the web development stack is necessary as it helps you to effectively reach your goals. So here we’ve curated some tech stack and what tools you can use to build your web products.

What Is Web Development Tech Stack?

It is a backbone of a smooth-running website or web application.  It establishes the code and execution of web app development. So while building a web solution one must focus on the tech stacks. Simply, tech stack consolidates all the programming languages, libraries, structures, tools, software and so on important for developing a seamless website and web app. You might think that a technology stack is a combination of software tolls and programming languages that are used to bring your web or mobile applications to implementation. Shortly, web and mobile apps consist of a frontend and backend, that are client-facing apps and hidden part that’s on the server, respectively.

Every layer of app is built on the one below, which forms a stack. This makes web stack technologies dependent on each other. Let us see the technology stack for each layer.

You can know the considerations to choose the technology for Web Application at- Effective Considerations to choose the technology for Web Application

Best Web Development Stack In 2021-

Frontend Web Development Technology Stack-

1. Angular-

Introduced by Google in 2009, Angular is a best frontend web app development framework which depends on TypeScript and used by a huge community of designers. It is a single page app framework meaning that angular is used to build single page web apps or SPAs. Since the start of 2018, web app development with Angular has helped the community grow 50% compared to 2018. The advanced Angular expects you to know about Typescript language and some of the different features to the language that Javascript needs. Here are some of the pros and cons of Angular. 

Know the features of Angular 11 at- What’s New In Angular 11?

Pros–

• Robust ecosystem
• Huge community
• Easy two way data binding
• Iterative development support
• Simple to work with HTML templates
• Dependency injection
• Component based architecture

Cons–

• Need more memory
• Hierarchical tree-like structure
• Steep learning curve

2. VueJS-

It is going to be one of the top front-end technology stack for 2021. VueJS is a lot simple for those who know HTML, CSS and Javascript. It is simple to execute and light without any numerous conditions. Vue.js is such a hybrid among heavier and bigger systems like Angular. If you have an application, Vue is simple to coordinate right in without doing significant reworking or code refactoring. With VueJS you’ll get all the main features you need like data binding. Here are some of the pros and cons of VueJS.

Know the amazing new features of VueJS 3.0 at- What’s New In Vuejs 3.0 ?

Pros-

• Reactive two-way data binding
• Great for unit testing
• Huge community support
• Virtual DOM rendering and performance
• Good code readability
• Efficient component reusability
• Concise documentation

Cons-

• Limited resources
• Language barrier
• Lack of support for large-scale projects
• Risk of over flexibility
• Reactive complexity

3. React-

It is a Javascript library which joins the speed of Javascript and uses another method of delivering website pages, making them unique and receptive to client input. The thing generally changed the Facebook approach to deal with development. After the library was delivered, it ended up being incredibly famous as a result of its progressive way to deal with  programming UIs setting the long-going Comparison Between Angular vs React vs Vue. These days, ReactJS is highly used open-source web based technology. It helps to make great web apps that need minimal exertion and coding. Main goal of ReactJS is to create user interfaces which improve the app speed. 

Pros-

• Simple to use
• Reusable components
• Open-source community
• SEO friendly
• Dynamic web app development is easy

Cons-

• JSX barrier
• Poor documentation

Backend Technology Stack-

1. Laravel-

It is a best tech stack to build websites because of rich syntax and extraordinary environment of various toolsets that allows you to effectively and rapidly build the solutions using PHP. App scaling, zero downtime organization, 0Auth2 execution, membership billing is implicit natively with Laravel.

Pros-

• Fast development cycle
• Supports prominent cache backends
• Easy authentication
• Automatic testing
• Active Record Implementation
• Artisan – Laravel’s dedicated tool
• Configuration error and exception handling
• Queue Management
• IoC Container
• Lots of packages and resources
• Integrates with mail services

Cons-

• Composer is not enough strong
• Issues with some upgrades
• Lack of inbuilt support

2. Python-

Established in 1991, it is a high-level, well-interpreted and dynamic top web development language which focuses on code readability. Syntax of Python is easier than C++ or Java which helps developers to code in a few steps. Mainly it has a large and comprehensive standard library that has an automated program management system. Because of its adaptable features and less code, most of the software development companies prefers Python over other languages.

Know the amazing features of python 3.10 at- Must Know Features Of Python 3.10

Pros-

• Simple to read, learn and write
• Extensive library support
• Improved productivity
• Enhanced control capabilities
• Great web service tool
• Object oriented designs and modules

Cons-

• Weak in mobile computing
• Not memory efficient
• Slow in speed
• Database access layer is underdeveloped

3. ASP.NET-

ASP.NET Core is an open-source variant of ASP.NET. It is a popular web development framework for developing web apps on .NET stage. ASP.NET is a lot rapid to develop than the available frameworks. It can be efficiently developed on Linux, Docker, macOS and windows, also supports various lifecycle options to meet specific requirements.

Pros-

• Reduces development time
• Cross-platform migration
• Customizability and extensibility
• Allows for separation of concern 
• Security
• Out-of-the-box feature list
• Manageability

Cons-

• Lack of proper documentation
• Porting ASP app is expensive

Databases-

1. AWS-

Released in 2006, it is a Cloud IaaS stage which gives computing power, information stockpiling and other IT solutions utilities for organizations. Using AWS, amazon has made it feasible for organizations to dispose of the need to assemble and manage private, on-premise frameworks. Clients can compensate for what they require, make a more adaptable model without management overhead to use a similar architecture on site. Aws is more safe than organization using its own site or data. 

Pros-

• Simple to use
• Reliable and highly secure
• Flexible
• Auto scaling
• Provides agility and speed
• Elastic load balancing

2. MongoDB-

It is a popular NoSQL databases which stores data in BSON. Working with MongoDB NoSQL database is simpler than working with any relational database. In MongoDB there is no tables. All data is stored in JSON format. In JSON, you characterize a one-of-a-kind key with its value. Those key-esteem sets are put away in an archive, that so put away in a collection. Collection in MongoDB can have few records and such archives can have key-esteem sets.

Pros-

• It is free to use
• Uses internal memory for storage
• easy to set-up and install
• No need of complex joins
• Doesn’t need object mapping

Wrap Up-

These are some of the well known and best tech stack to use in 2021. Selecting the appropriate technology stack is a challenging task and hugely affects the app development process. Are you thinking of developing the best website or web app? Then you must know these popular tech stack. You can consult with Solace experts for choosing the best tech stack for effective web solution development. Connect with Solace and get a free quote for a successful web development for your business as per business needs. You can also hire angular developer, firebase developers, laravel developers of solace team on a flexible basis. We will be happy to help you.

Top 7 Javascript TreeGrid Libraries/Widgets In 2021

 

We all know that Javascript is a high-level, dynamic and untyped programming language. Basically it creates an interactive and phenomenal impact on web browsers. Web app development is easy with Javascript and HTML tables, Javascript components are becoming instinctive string between customer and end-user. HTML tables with lots of data can be controlled with the help of libraries. One of such popular and convenient approach is the Javascript tree component that makes data rich apps. It is a way to deal with data that gives various advantages to end client. And hence UI trees give an opportunity to show huge amounts of data in a compact way. It also shows the inadequacy to work with large trees. The data from such trees don’t fit in the recognizable area of interfaces. 

TreeTable component appeared as a reasonable response to the complexity of work with UI Trees. Whereas, TreeTable is a great DataGrid that allows convenient data presentation in an even structure. Also, it plays out a tree-like, various leveled gathering of even data like Tree widget. Don’t get confused about the TreeTable component with features similar to DataGrid Rows and Columns grouping. Some of the SpreadSheet JS widgets may have various hierarchical data gathering widgets but TreeTable is a modern and complex solution as it bunches an entire array of information.

Here we will see the details of 7 best TreeGrid libraries to use in 2021. But before digging into TreeTable libraries let us see what is TreeGrid?

What Is TreeGrid?

It is a method of arranging table data as a rundown of hierarchical tables. TreeGrid enables developers to make tree-like lists where entire tables are used as “branches”. Let us see the features of TreeGrid. 

Features Of TreeGrid-

1. End-to-end Sorting- 

Table things can be arranged with a single snap on the header of a segment. You can use the sort work for explicit sorting conduct.

2. Editable-

TreeTable has a full scope of grid manipulation. You can modify its component by composing the new value in the data field or choosing among drop-down list that can be provided with checkboxes for better convenience.

3. Selection Mode-

Due to TreeGrid, you can choose data in one of the accessible modes: cell, line,segment, multi section, multi-cell, multi-line, square or zone determination mode.

4. Data Export-

This Javascript TreeTable component allows trading data to PNG, PDF and Excel documents for extra preparation. You can also characterize the appearance of subsequent table by including various export options. 

5. Clip-board-

Clipboard support lets you to reorder things inside the TreeTable component and paste data to other components. This element works in modes like- ‘choice’, ‘square’ and rehash.

6. Filtering- 

TreeTable supports customer side filtering. You can also use built-in or custom filters. According to the data,you can use one of the channels for required section: date filter, number filter, rich select filter, multi combo filter, etc.

Top 7 Treegrid Libraries And Widgets-

1. jQuery TreeTable-

It is a module for the jQuery Javascript library. This shows the tree as an HTML table. Widgets lets you to create a couple of segments to show some data other than tree where tree depth does not have any limit. jQuery JS library is light and quick that rearranges the web development process. It includes simple to use APIs that different programs support. Some of its great features are- Sorting, Filtering, Paging, Data export, row editing and validation, row details, columns resizing, column hierarchy,  Cells formatting, custom cells rendering, keyboard navigation etc.

2. Webix TreeTable Widget-

It is a most professional and functional widget based on Webix DataGrid widget and having the highest performance web control. Some of the great features of Webix TreeTable are, clipboard support, advanced data filters, embedded chart lines(SparkLines), rowspan, colspan and grid grouping. This widget improves ability to change the width of all fields, create vertical headers and throughout elaboration of drag-n-drop individually for rows and columns. 

3. Treegrid-

It is a DHTML component which allows you to display and edit data in grid, table, grid tree, tree view or histogram on an HTML page. It is a rapid AJAX grid with lots of advanced features like advanced formulas and cell calculations. TreeGrid component allows you to load data in XML & JSON formats. This widget is available under the basic, standard, personal and Grand licenses.

Some of the great features of Treegrid are- Creating gantt charts, pivot tables, update and display custom Javascript objects and external objects like Adobe Flash, Microsoft silverlight, different editing masks, bulk cell changes, calender component, exporting to MS excel or other spreadsheets which handle XLSX, XLS, CSV or HTML table files, localization to any languages etc.

4. Sencha TreeGrid Widget-

It has Javascript structure which gives different instant UI parts to create high-load, cross-stage web apps. Important component of this javascript Treegrid library is its great TreeGrid widget. Some of the great features of Sencha TreeGrid widgets are- keyboard navigation, numerous headers, sorting, bifurcating, preloading hubs with single AJAX demand, rearranging/resizing header, custom symbols and so on. 

5. Syncfusion TreeGrid Widget-

It provides 1600+ components and a framework for mobile, web and desktop development. With various customization choices, you can deliver ideal client experience while saving money and time. It is an element rich segment to show data in a plain arrangement. Its broad scope of functionalities includes, editing, data binding, excel-like filtering, custom sorting, row aggregation, selection, excel support, CSV and PDF formats.

6. DHTMLX TreeGrid Component​-

It is an extension of the dhtmlxGrid component which complements the functionality of powerful data grid with competent XML parsing, extensible strings, pagination support and elegant rendering. Because of based on AJAX, Treegrid javascript component with dynamic loading can display unlimited rows and processing huge data on the fly. Also, it provides end-users with convenient built-in editing, advanced row and column dragging, split mode, posts sorting and coloring, and some mathematical functions. DHTMLX TreeGrid can be easily styled by using CSS and built-in skins. 

7. Ignite UI Tree Grid-

igTreeGrid library provides hierarchical data by combining principles of tabular and tree data into a single control. It inherits the igGrid control and hence enjoys lots of features and functionality like igGrid. Also some features contrast in function and implementation to best suit the needs of hierarchical data.

For adaptability and flexibility, the treegrid has expansion indicator, which can be delivered inline in main data section or  in the independent segment. Expansion indicator can be modified with an alternate look and feel to accomplish custom visualizations.

Final Words-

Purpose of TreeGrid Javascript libraries is to bring the concept of tree and table function together in a single widget. Here we’ve seen top 7 Javascript TreeGrid libraries to use in 2021. Also, on the basis of functionalities, the Webix JS and DXTMLX libraries are important open-source treeGrid libraries that help structure the tree into an editable grid and hence, easy to work with huge amount of data.

If you are confused about choosing the TreeGrid library, consult with solace experts. We are here to help you through consultation and development. You can also hire javascript developers of Solace team for an effective Javascript development. Connect with Solace and get a free quote for software development with javascript. We will be happy to help you.

Ruby Vs Java- A Detailed Comparison

 

Whenever you are going to build a website or web app, you should consider various issues like hiring a software development company, defining project goals, and preparing software requirement documents. Apart from this, another important question is to choose the right technology stack. Ruby and Java both are popular languages to build web solutions. But which one to choose for enterprise web application development is a big question? So, here comparing Ruby vs Java, we find differences between these coding languages to make the right choice. Here, we will cover the decision -making factors that help you to make the right choice for your app development in 2021. But before digging into the comparison, let us see the overview of Ruby and Java.

Ruby-

Programming language Ruby is an interpreted server-side scripting language. It is much more flexible and dynamic, and allows programming constructs like reflection, dynamic typing or dynamic scoping. There is no need of compilation process and Ruby code is not executed directly by the processor but by a so-called interpreter. This reads the script code and converts it at runtime into processor executable code. So, in order to run Ruby scripts, an appropriate interpreter must be present on the executing machine. Ruby interpreters are available for today’s popular platforms Windows, Mac OS X, and Linux. 

Key Features-

• Open-source
• Multi-platform
• Interpreted language
• High scalability
• Dynamic + duck typing
• Has smart garbage collector
• Can embed Ruby into HTML
• Applicable to write CGIs, build web and intranet applications
• Support of various GUI tools including OpenGL, Tcl/Tk and GTK
• Support of Sybase, Oracle, MySQL and DB2 connection

Java-

Java is a programming language based on C and C++ syntax. It doesn’t have pointers and so programmers cannot accidentally access the wrong memory address. Java is highly valued as an object-oriented, secure, easy-to-learn and computer-language independent programming language. Various sophisticated features like exception handling, concurrency and graphical user interface have been integrated into Java programming language. Java apps run under Windows and MacOS, various Linux and Unix derivatives, and even in web browser- and on different processor substructures x86, ARM or PowerPC. 

Key Features-

• Object-oriented language
• Open-source
• Compiled and interpreted language
• Static typing
• Built-in security
• Simple memory management model
• Platform independence
• Multithreading capabilities
• Automatic garbage collection
• Dynamic compilation and dynamic class loading

Ruby Vs Java- A Comparison

1. Language Maturity-

Ruby-

It is a general purpose programming language having first stable version released 1.0 in December 2005. Latest version of Ruby 6.1 was out in December 2020 and the community is waiting for the to be released TBA version 7. According to history, the Ruby community is strong and has a great scope in the future. One can surely rely on the rails framework or enterprise app development.

Java-

First stable Java version JDK 1.0.2 was released in 1996. Thereafter, successfully Java standards editions 6, 7, 8, 9 and 10 was released in 2006, 2011, 2014, 2017 and 2018. Later on, stable versions 12, 13, 14 and 15 were released last in September 2020. From the above efficient history of Java, we can understand the vast community, maturity, stability and scalability of Java programming language.

2. Architecture-

Ruby App Architecture-

MVC-

Ruby follows the convention over configuration COC strictly and implements MVC(model view controller) architecture to ease the maintenance of RoR application. One of the biggest advantage of using MVC architecture is that you can keep the business logic and display of your application separate an so your app doesn’t affect when something goes wrong. This keeps the model(database), view(frontend) and controller(business logic) separate. 

Model-

In ruby app, models consist of database information which allow validation and helps them to communicate amongst themselves.

View-

View, frontend of R app includes HTML pages and some other formats like PDF, RSS, XML etc.

Controller-

It interlinks the model with view- logic of application. Controller processes the browser requests and sends the result to the view.

Java App Architecture-

Java programming architecture will help you to understand the execution and implementation of Java code. There are two consecutive processes- compiling and interpretation. Let us see, how java program file runs.

• Code that you write first goes to the Java compiler
• Compiler converts source code to byte code
• Then, this byte code moves to the java virtual machine
• JVM converts byte code into machine code and your java program is executed

3. Development Environment-

Though Java is compiled, turn-around times are short. This is due to current development environments such as Eclipse that use an incremental compiler. Java programmers have access to tools which override various language specifics. 

Among Ruby programmers, it is still widely used to depend on vim or emacs for lack of mature development environments. Also, the main commercial development environments are already appearing and both blend into Eclipse and the Free RIDE written in FXRuby will be further developed.

4. Deployment-

In J2EE environment, many XML files are typical to edit. Also special archive files (Jar, Ear, War, etc) must be generated. This can be done through plugins integrated into the development environment, or you can use a deploy tool from an app service provider. For small apps, it is sufficient to master Ant. Webstart addresses the subject of updates.

With Ruby, RubyGems develops to the deployment standard. Also, the web framework Ruby or continuous integration server Damage control comes as Gems. There are usual, platform-dependent delivery strategies in both Java and Ruby like Windows installer or Debian packages.

5. Typing-

Know more at - https://solaceinfotech.com/blog/ruby-vs-java-a-detailed-comparison/

Grey Box Testing – All You Need To Know About

 

Testing plays a vital role in development of stable and secure software solutions and verify that software performs as expected. Most common approaches of software testing are white box testing, black box testing and gray box testing. White box testing and black box testing have their own pros and cons. Gray box testing combines two testing approaches so as to overcome their deficits. It aims to amend the loopholes and shortcomings found in white box and black box testing. It has been developed to be a beneficial blend of the two testing techniques. In Grey box testing, testers have access to the design document and database rather than only the user interface. It is also called translucent testing. This kind of testing can be used to debug software and evaluate vulnerabilities. Before digging to the details of Grey box testing, let us see what is Grey box testing?

What Is Grey Box Testing?

Grey Box Testing

Grey box testing is a testing technique which is a combination of White box testing and black box testing. In white box testing the internal structure of  product is known whereas in black box testing internal structure is unknown to the tester. In Grey box testing internal structure is partially known and it includes access to internal data structures and algorithms to design the test cases. Commonly it focuses on context-specific errors related to web systems. Grey box testing is a great way to find security flaws in programs. It can help to discover bugs or exploits because of the incorrect code structure or incorrect use of applications. 

Grey box tester takes the code-specific approach of white box testing and combines it with various approaches of black box testing such as functional testing and regression testing.

Need Of Grey Box Testing-

• Grey box testing is independent of platform and language
• It can test data domains, internal boundaries and overflow.
• Checks the high level design environment and interoperability conditions
• It can detect defects that are not easily detected by black box or white box analysis, like end to end information flow, distributed hardware/software system configuration and compatibility.
• This testing can uncover several context-specific errors 
• It combines the input of developers as well as testers and improves overall product quality

How To Perform Grey Box Testing?

While performing gray box testing, it is not necessary to design test cases from the source code. Testers can design test cases as per algorithms, internal states or high-level description of code. Let us see the steps to  perform grey box testing.

Steps To Perform Grey Box Testing-

• Identify inputs from Blackbox testing and white box testing and select the appropriate test data.
• Identify the expected outputs from the selected inputs
• Recognize the major paths to traverse through during the testing period
• Identify the sub-functions that are part of main functions to do deep level testing
• Point out inputs for subfunctions
• Identify the expected outputs for subfunctions
• Start execution of test case for subfunctions
• Verify correctness of result

Grey Box Testing Techniques-

1. Matrix Testing-

It begins when developers define variables in their program, status report of the project is stated. Every variable may inherent technical risks, business risk and also can be used with different frequency during its life cycle.

2. Pattern Testing-

It analyses the historical data of previous system defects. Testers inspect the code and try to determine the reason for failure. This can help the team in test case designing and so helps in finding the failures proactively. This kind of test case design gets influenced by coding structure of app.

3. Orthogonal Array-

It is a statistical testing technique generally executed in complex applications. Gray box testing blends the power of statistical testing and elaborate testing to provide proper coverage. This helps to reduce the number of combination to provide maximum coverage with the minimum number of test cases. 

4. Regression-

To check whether the change in the previous version has regressed other aspects of the program in the new version. It will be done by testing strategies such as retest all, retest risky use cases, retest within a firewall.

Black Box Testing vs White Box Testing vs Grey Box Testing-

	Black Box Testing	White Box Testing	Grey Box Testing
1	For black box testing knowledge of internal working structure (Code) is not required.	For white box testing knowledge of internal working structure (Coding of software) is necessarily required.	For Grey box testing, partially Knowledge of the internal working structure is required.
2	Black Box Testing is also known as functional testing, data-driven testing, and closed box testing.	White Box Testing is also known as structural testing, clear box testing, code-based testing, and transparent testing.	Grey Box Testing is also known as translucent testing as the tester has limited knowledge of coding
3	Black box testing approach includes trial techniques and error guessing method because tester does not need knowledge of internal coding of the software.	White Box Testing is proceeded by verifying the system boundaries and data domains inherent in the software as there is no lack of internal coding knowledge.	If the tester has knowledge of coding, then it is proceeded by validating data domains and internal system boundaries of the software.
4	It is difficult to discover hidden errors of the software because errors can be due to internal working which is unknown for Black Box testing.	It is simple to discover hidden errors because it can be due to internal working which is deeply explored in White Box testing.	Difficult to discover the hidden error. Might be found in user level testing.
5	It is not considered for algorithm testing.	It is well suitable and recommended for algorithm testing.	It is considered for algorithm testing.
6	Tester, developer and the end user can be the part of testing.	Only tester and developer can be a part of testing; the end user can not involve.	Tester, developer and the end user can be the part of testing.
7	It is less exhaustive than White Box and Grey Box testing methods.	It is most exhaustive between Black Box and Grey Box testing methods.	Partly exhaustive; depends upon the type of test cases are coding based or GUI based.

Advantages Of Grey Box Testing-

• For grey box testing, there is no need of high programming skills.
• It is non-intrusive.
• Quality of product is improved
• Users and developers have clear goals while testing
• This testing avoids conflicts between tester and developer
• In this type of testing, developers have more time for defect fixing
• Gray box testing is much more effective in integration testing.

Disadvantages Of Grey Box Testing-

• Limited access to internal structure leads to limited access for code path traversal
• Source code cannot be accessed so doing complete white box testing is not possible
• It is not suitable for algorithm testing
• Many test cases are difficult to design
• While performing this kind of testing for distributed systems, defect association is difficult.

Gray Box Testing Challenges-

• Testers may not be given access to the source code so it can result in missing certain critical vulnerabilities.
• It can be unrealistic and time-consuming to check every potential input i.e chances are there that particular program paths will not be tested.
• It needs more time to cover the input path for a large application, this can increase project budget, and can increase project deadline.

Final Words-

Testing plays an important role in software development and grey box testing one of its kind. Here you’ve seen the basics of grey box testing.

What’s New In React 17?

 

React is one of the most popular Javascript library and it is an efficient, declarative and flexible Javascript library used to build user interfaces. It has more than 156000 starts on GitHub and is one of the vibrant frontend communities building great applications. React has taken some important steps to improve the developer experience and efficiency of react-built applications. Here we’ll see changes in react v17. 

Know the most common mistakes that you must avoid in react development at- Most Common Mistakes To Avoid In React Development

What’s New In React 17?

1. v17 Allows Gradual React Upgrades-

When you update your entire application from React 16 to 17, the application may work well. But if the codebase was written more than few years ago and is not maintained regularly, it may cause difficulty for you. Although two versions of React can be utilized on the website, it was not stable and caused event issues until react v17 came into the focus. Some improvements have been made to the React event system so as to allow gradual upgrades. React 17 is an essential release because the changes could break down.

2. No Event Pooling-

Starting from this new version, event pooling optimization has been removed from React because of confusion and the simple fact that doesn’t improve modern browser performance.

function handleChange(e) {
  setData(data => ({
    ...data,
    // This crashes in React 16 and earlier:
    text: e.target.value
  }));
}

The team of React calls this a behavior change and has labeled it breaking, although they have not seen it break anything at Facebook, so the chances are very low. Also, e.persist() is still available on event objects, in spite of the fact that it does not do anything.

3. Changes To Event Delegation-

In react components, usually you write event handlers inline:

<button onClick={handleClick}>

The vanilla DOM equivalent to this code is like:

myButton.addEventListener('click', handleClick);

React does not connect them to the DOM nodes you declare on most events. Instead, it adds one handler per event type directly at the document node. This is called a delegation for event. It makes it simple to add new features like replaying events, apart from its efficiency advantages for large apps. From its initial release, React has done event delegation automatically. When DOM event initiates on a document, React understands which component to call and then the React event goes upwards through components. Whereas, in reality, the native event has already bubbled up to document level where React installs its event handlers. 

4. Effect Cleanup Timing-

New version makes the useEffect Hook cleanup function timing more consistent.

useEffect(() => {
  // This is the effect itself.
  return () => {    // This is its cleanup.  };});

In the previous version React 16, the effect cleanup function is run synchronously, that don’t delay screen updates and which React runs asynchronously by default. The React team has discovered that this synchronous process is not so ideal, just like it is not with componentWillMount for large applications when the user switches tabs.

This new version of react brings some new changes. The effect cleanup function will work asynchronously like others and if component is un-mounting, the cleanup will only run after updates are shown on screen.

5. Removing Private Exports-

For web, react native used to rely on specific internals of the system, but this dependency became weak and used to clash. These private exports ended in React 17. We know that React native for web was the only project that used them and that migration to new method has been already completed which doesn’t rely on these private exports. This means that old React Native Web version won’t be compatible with React 17 but still work with updated versions. In reality, it don’t affect because React Native had to release new versions to adjust to changes in its internal react.  

6. New Lifecycle Methods-

Two new lifecycle methods are switched with deprecated lifecycle methods- getDerivedStateFromProps and getSnapShotBeforeUpdate. Some processes are replaced by these new lifecycle methods. For example, componentWillUpdate can be replaced by getDerivedStateFromPropstogether with shouldComponentUpdate, componentWillMount should be removed altogether for async rendering.

getDerivedStateFromProps–

This method is bound to replace componentWillReceiveProps and componentWillUpdate and will be called after a component is created and when it received new props.

This returns an object to update state when props change or null when there is not change in state.

state = { cachedSomeProp: null };
static getDerivedStateFromProps(nextProps, prevState) {
return {
cachedSomeProp: nextProps.someProp,
..
};
}

getSnapshotBeforeUpdate-

It manages the component changes and replaces componentWillUpdate efficiently and operates with componentDidUpdate. This is called and returns the value to the componentDidUpdate that handles the changes before DOM updates:

class ScrollingList extends React.Component {
listRef = null;
getSnapshotBeforeUpdate(prevProps, prevState) {
if (prevProps.list.length < this.props.list.length) {
  return (
    this.listRef.scrollHeight - this.listRef.scrollTop
  );
}
return null;
}
componentDidUpdate(prevProps, prevState, snapshot) {
if (snapshot !== null) {
  this.listRef.scrollTop =
    this.listRef.scrollHeight - snapshot;
}
}
render() {
return (
{/* …contents… */}
);
}
setListRef = ref => {
this.listRef = ref;
};
}

7. Browser Alignment-

Some changes have been made to event system in React, which includes:

• To avoid confusions like firing when scrolling through child elements, the onScroll event no longer bubbles.
• The events React onBlur and onFocus have now switched to using native focusin and focusout events internally, better matching react’s existing behavior and even providing more information.
• Capture phrases events like onClickCapture now use actual browser capture phrase listeners

These changes align React more closely with how browsers behave and improve interoperability.

You can also know the reasons to render React on server side at- Why You Should Render React On Server Side?