I recently did some research on blockchain, crypto, and Web 3.0 finally, trying to understand the buzz, and I must say it’s quite interesting, but not necessarily in a good way 😅 I’ve been wanting to share my take, so here it is: Blockchain, as I understand, is another software application backend, like a SQL… Continue reading Web 3.0?
This post covers how to run a web development project (application) that was build for Mac OS on Windows. I will be using Windows Subsystem for Linux (WSL), which is a new feature added in Windows 10 that allows you to run Linux operating systems in a terminal from your Windows desktop. Step 1: Install… Continue reading Running A Web Dev Project Built for Mac on Windows
So I got my first Original Equipment Manufacturer (OEM) prototype made. If you’ve been following my blog, you know I’ve been working on an Internet-of-Things devices for the past few years as a side project. It’s been a ton of learning, and a very worthwhile undertaking overall. I’ve learned so much: woodworking, CNC, metalworking, welding,… Continue reading My First OEM Prototype
One concept that is considered “advanced” in JavaScript is closures. MDN defines closures as: A closure is the combination of a function bundled together (enclosed) with references to its surrounding state (the lexical environment). In other words, a closure gives you access to an outer function’s scope from an inner function. In JavaScript, closures are created every time… Continue reading Getting Your Head Around JavaScript Closures
Any web application of significant complexity is going to require user-level security. In this post, I walk through how to create authorization for users in a MERN (MongoDB, Express, React, and Node) stack web application. Full code is available here: https://github.com/dikuw/mern-passport This post assumes knowledge of React and node.js and just shows how to incorporate… Continue reading MERN Authorization with Passport.js
This is a minimal example of how to upload a file to Node.js server using React.js on the front end. The Node.js server will run Express for simplicity, and takes advantage of the Express File Upload package. The server code is as simple as a single file server.js as follows: This will load a file… Continue reading Upload a File to a Node.js Server Using React
React is a beast like no other. While I found learning node.js to be pretty straight-forward with some JavaScript experience, React has a lot of functionality obscured, making it harder to learn and understand right out of the gate. Further complicating things is that React is relatively young (initial release May 2013), and has changed… Continue reading Updating State in React
A quick example of how to refactor out a While loop in JavaScript by using recursion instead. The problem is as follows (from TestDome): Your company assigns each customer a membership ID, and you are implementing a check digit for those IDs. The check digit should be calculated by adding up all digits in each… Continue reading Refactoring a While Loop with Recursion in JavaScript
A simple counter component in React can look like this: The component initializes the state variable “counter” with the value zero and then updates it by one every time the button is clicked. See it working here. This same code can be written much more cleanly using class properties instead of constructor properties, like so:… Continue reading Class properties versus Constructor in React
A common beginner (?) programming question is as follows: Given an array of items, find how many instances of each item occurs in the array. For example, given the below array of US states, return an object with the count of number of instances of each state: The interesting thing about this problem is it… Continue reading Clean Aggregation with JavaScript ‘Reduce’
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