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Speculation Rife as User Pays a Second $2.6 Million Fee in Ether Transaction

11.6.2020
History repeated itself on Thursday, after the Ethereum blockchain processed another transfer with fees of $2.6 million – the second such unusual, record-fee transaction in 24 hours. A user sent 350 ether (ETH), worth about $86,400 and paid 10,668 ETH, or $2.6 million, in transaction fees....

How They Fit Together: Transform, Translate, Rotate, Scale, and Offset

30.3.2020
Firefox 72 was first out of the gate with "independent transforms." That is, instead of having to combine transforms together, like: .el { transform: rotate(10deg) scale(0.95) translate(10px, 10px); } ...we can do: .el { rotate: 10deg; scale: 0.95; translate: 10px 10px; } That's extremely...

In-Browser Performance Linting With Feature Policies

26.2.2020
Here’s a neat idea from Tim Kadlec. He uses the Modheader extension to toggle custom headers in his browser. It also lets him see when images are too big and need to be optimized in some way. This is a great way to catch issues like this in a local environment because browsers will throw an error...

Bitcoin History Part 17: That Time Mt. Gox Destroyed 2,609 BTC

21.9.2019
Technically speaking, it’s impossible to destroy bitcoins. But it is possible to send coins to an unspendable address, rendering them redundant to all intents and purposes. In October 2011, that’s exactly what Mark Karpeles did when he consigned 2,609 BTC to eternal oblivion due to...

Kontrolní číslice čárového kódu (úloha z kroužku programování pro děti)

12.9.2019
Kolik lidí si podle vás v supermarketu kontroluje účtenku, aby se ujistili, zda jim namarkovali vše správně? Obvykle ne mnoho, jelikož čárový kód je tak spolehlivý, že mu důvěřují, že funguje. (Já tedy vídám, že si to lidé kontrolují a namátkově to dělám tady. Přeci jen je tam lidský prvek, ne...

Model-Based Testing in React with State Machines

4.9.2019
Testing applications is crucially important to ensuring that the code is error-free and the logic requirements are met. However, writing tests manually is tedious and prone to human bias and error. Furthermore, maintenance can be a nightmare, especially when features are added or business logic...

Fetching Data in React using React Async

1.8.2019
You’re probably used to fetching data in React using axios or fetch. The usual method of handling data fetching is to: Make the API call. Update state using the response if all goes as planned. Or, in cases where errors are encountered, an error message is displayed to the user. There will always...

JavaScript Proxy with Storage

26.7.2019
The JavaScript Proxy API provides a wealth of “magic” within JavaScript, allowing you to use any object as sort of an alias that allows a wall of validation, formatting, and error throwing. Did you know that you could also employ the Proxy API as an abstraction to different types...

Finally… A Post on Finally in Promises

16.7.2019
“When does finally fire in a JavaScript promise?” This is a question I was asked in a recent workshop and I thought I’d write up a little post to clear up any confusion. The answer is, to quote Snape: ...always. The basic structure is like this: try { // I’ll try to execute some code...

The Circle of a React Lifecycle

23.4.2019
A React component goes through different phases as it lives in an application, though it might not be evident that anything is happening behind the scenes. Those phases are: mounting updating unmounting error handling There are methods in each of these phases that make it possible to perform...

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