In Part 1 to 4, we went through solidity to develop smart contract in Remix, setup development environment, created unit testing methods for smart contract, created a front-end application with Node.js to interact with smart contracts. Now, we will deploy smart contract using truffle and infura. Also, will deploy Node.js application to Heroku.
Category: Node.js
Creating Web App for Smart Contract [Full Stack Ethereum Dapp Part-4]
In Part-3, we created unit test methods for smart contract. Now, we will create a simple webpage to interact with the smart contract. The goal is to create a page with a textbox to enter name, buttons to save name and to get message.
JavaScript: Select Date Time with Timezone
This tutorial explains how to implement to get a JavaScript date object from user selected date time & timezone and the date object can be sent server side to save or for further processing. HTML5 provides input type datetime-local allows user to enter both a date and a time and the user’s local time zone is used. For simplicity, Let’s enhance this to allow user to select any timezone. We are going to use Moment-Timezone library.
JavaScript Async/Await: Serial, Parallel and Complex Flow
If you have experience on ASP.NET MVC then probably you are familiar with async/await keywords in C#. The same thing is now in JavaScript. Before that, Callbacks and Promises are used for asynchronous code. Async/await is built on top of promises and non blocking. The power of Async/await provides asynchronous code look like synchronous code. In this article, we will go through serial/chain and parallel flow and implement a complex flow using Async/Await.
Read Also: JavaScript Promises: Understanding Error Handling with Example
Visual Studio Code: Debugging ES6 Mocha tests with Babel
In my post, I explained how to test server side REST APIs in Node.js using Mocha, Sinon and Chai. I used ES6 test methods for this and Babel is used to execute it. As test methods are executed at development end, so NO need to transpile ES6 to ES5 first and then debug the converted files. You can directly debug ES6 code with Babel.