Once you have a subgraph, it allows you to write one simple query in your dapp that retrieves all the important blockchain data including historical ones that you need, only one fetch required. Check out the subgraph explorer (opens in a new tab) ↗. If you are looking for popular smart contracts, there may even already be a subgraph. Use the create-eth-app subgraph package, read the documentation (opens in a new tab) ↗ and adapt it to your own contracts. You want to know not only the last trade time, but the times for all trades that you ever did yourself. This is not always ideal though.Īnd then you might be interested in historical data as well. One workaround might be a fetcher call function inside your contract that returns multiple data at once. But what if you need hundreds of different data points? That would result in hundreds of data fetches to the node, each time requiring an RTT (opens in a new tab) ↗ making your dapp slow and inefficient. Want to read the time of the latest trade? Just call M圜().call() which fetches the data from an Ethereum node into your dapp. Usually you would fetch data from your smart contract directly. If you are interested in the reasoning behind this, have a look at GraphQL Will Power the Decentralized Web (opens in a new tab) ↗. They have several advantages over Restful Apis, especially for decentralized blockchain data. GraphQL (opens in a new tab) ↗ is an alternative way for handling data compared to a Restful API (opens in a new tab) ↗. You can work with this one, change it to Web3 or consider upgrading to ethers.js v5 (opens in a new tab) ↗ which is almost out of beta. While Web3 (opens in a new tab) ↗ is still mostly used, ethers.js (opens in a new tab) ↗ has been getting a lot more traction as an alternative in the last year and is the one integrated into create-eth-app. ![]() This especially makes sense for smaller additional packages like smart contracts addresses/ABI management (the information about where you deployed which smart contracts and how to communicate with them) or the graph integration, both part of create-eth-app. Yarn Workspaces (opens in a new tab) ↗ allow you to have multiple packages, but being able to manage them all from the root folder and installing dependencies for all at once using yarn install. See below section about Apollo for how they are used in create-eth-app. A method to write powerful, yet very small so-called functional components. The create-eth-app in particular is making use of the new hooks effects (opens in a new tab) ↗. A build script to bundle JS, CSS, and images for production, with hashes and sourcemaps.A live development server that warns about common mistakes.A fast interactive unit test runner with built-in support for coverage reporting.Autoprefixed CSS, so you don’t need -webkit- or other prefixes.Language extras beyond ES6 like the object spread operator.React, JSX, ES6, TypeScript, Flow syntax support.The create-react-app makes it really easy to start with it as well and includes: It may not be as beginner-friendly as Vue (opens in a new tab) ↗, but it is still mostly used, has more features and most importantly thousands of additional libraries to choose from. React (opens in a new tab) ↗ itself makes building interactive UI's really easy. Only using this is a great option if you do not want to integrate Ethereum. Features React & create-react-appįirst of all the heart of the app: React and all the additional features coming with create-react-app. ![]() ![]() You can create a GitHub repo, add it to Netlify, setup the build command and you are finished! Your app will be hosted and usable for everyone. One easy way to host this would be Netlify (opens in a new tab) ↗. To see your app, open When you’re ready to deploy to production, create a minified bundle with yarn build. ![]() It is using create-react-app (opens in a new tab) ↗ under the hood.
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