Introduction to Reactjs
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- What is React? - Why use React? - Core Concepts - About Virtual DOM - Advantages & Disadvantages
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Apollo Server
GraphQL is a query language for APIs that allows clients to fetch exactly what they need from a data source. Apollo Server is a library that makes it easy to build GraphQL servers with Node.js. It provides features like combining multiple GraphQL schemas into one. GraphQL uses SDL to define the schema and relationship between types of data. Resolvers are responsible for returning data in response to GraphQL operations like queries, mutations, and subscriptions. Scalar types define basic data types in GraphQL like Int, String and ID.
Apollo Server III
This document discusses schemas in GraphQL. It explains that a schema defines the types and fields that are available in a GraphQL application. It provides examples of scalar types like String and Int and object types like Person with fields for name, id, age, and student status. It also describes special root types for queries, mutations, and subscriptions that define the entry points for GraphQL operations. Queries are executed against fields defined in the query type. Resolvers associate fields with data fetching logic and will be covered in the next session.
Getting Reactive Data
Topics covered :
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The document discusses state, lifecycle, methods, and events in React components. It defines state as an object containing data that causes a component to re-render when updated. Methods are functions bound to a component that can be called to handle events. Events are handled by passing a callback function as a prop rather than a string, and are named using camelCase. The component constructor or an arrow function can be used to bind methods and ensure 'this' works correctly in event callbacks.
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This document provides an overview of using React with Meteor to build web applications. It covers key React concepts like JSX, setting up a Meteor app with React, rendering React components to the DOM, updating component state and re-rendering, and conditional rendering based on state values. The examples demonstrate simple rendering, updating text via an input field and state, and showing/hiding an input field using a checkbox to conditionally render components.
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This document discusses the differences between monolithic and microservice architectures. In a monolithic architecture, all components of an application are interconnected and maintained within a single codebase, which can be inefficient to manage and scale as the codebase grows. Microservices address these issues by decomposing an application into smaller, independent services that communicate through APIs. This improves fault isolation, allows individual services to be developed and scaled independently, and makes it easier to adopt new technologies.
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Meteor is a full-stack platform for building modern web and mobile applications using reactive programming. It uses Node.js, MongoDB, and Socket.io under the hood. Reactivity in Meteor means that data displayed in templates will automatically update in the user interface when the underlying data changes in the database. Data flows from the server database through publications to the client using DDP (Distributed Data Protocol), and is cached locally using Minimongo.
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Webpack is a build tool that bundles assets including JavaScript, images, fonts and CSS into packages called bundles that can be consumed in the browser. It analyzes dependencies between files and packages them accordingly. The webpack configuration file specifies the entry point, output, loaders and plugins. Loaders transform files and plugins add functionality to bundles. Webpack differs from other build tools like Grunt and Gulp in that it generates dependency graphs to bundle assets optimally rather than just running predefined tasks.
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This document outlines the structure and key features of an app being built with Meteor to allow users to view and vote on cricket player stats. The app will allow admins to add player stats and users to upvote or downvote them after logging in. The summary covers setting up the file structure, adding templates and routing, and integrating the Meteor Accounts package for user authentication. Meteor CLI commands are also listed for creating projects, adding and removing packages, and checking out different steps of the project's development.
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Introduction to Reactjs
- 1. ReactJS A javaScript library for building user interfaces By - Sapna
- 3. A response to something!
- 4. Frontend Framework ● Frontend framework from ● A rich library for creating user interfaces. ● A component based system.
- 5. Why React?
- 7. JSX ● Allows you to mix HTML with JavaScript
- 8. Components ● Independent, reusable pieces
- 9. The Flow ● Unidirectional data flow.
- 10. Virtual DOM ● An abstraction of HTML DOM. Virtual DOM is light weight. ● Reacts local and simplified copy of HTML DOM. ● Virtual DOM where your components actually live. ● Allows React to do its computations within this abstract world.
- 11. Virtual DOM DOM
- 12. The good
- 13. ● Simplicity ● Components are just function of states. ● Efficient ● Testability ● It's awesome for SEO
- 14. The bad
- 15. ● No application framework. ● React is only a view layer.