Using Alchemy, i.e. the most popular blockchain provider, JavaScript and ethers library — Let me show you how you can create your own gas estimator to make sure that your transactions will be included and as cost-efficient as possible. Btw if you’re here just for a solution, the full script is available at the end of the article. Gas types and theory in a nutshell after the EIP-1559

And how to practically use the Merkle tree — In this article, we’ll dive into whitelisted NFT smart contracts, written in solidity. You’ll learn what is the whitelist, is the practical usage of the Merkle tree, and how to create whitelisted ERC721 in the most gas-efficient way when you have over a few thousand whitelisted addresses. Without further ado…

Make sure it doesn’t happen to you. — Hey JavaScript freaks 🤡! It’s funny. Every time you go job hunting, after a few interviews you have a list of “almost certain questions”, and there are specific questions on which I’ve failed because I wasn’t prepared. One of them is method chaining. A lot of people know that they…

And in addition, save yourself from using third-party libraries. — Did you ever have to create an infinite slider with different partner logos, or any other stuff when it comes to that? I don’t know about you, but my approach in scenarios like that is to most likely search online for some library and then just use it. This approach…

How sockets work, what you can do with them, and how to implement the functionality with NextJS — There is always something more that you can add to your application. Maybe you’ve created a beautiful dashboard but you don’t want your user to refresh the site every time there is something new. Maybe you want to send a notification when a new message is present. Maybe you always…

Understand the core concepts and learn how to use them. What are order books? Let’s start with the official definition: “The term order book refers to an electronic list of buy and sell orders for a specific security or financial instrument organized by price level.” Order books are pretty simple to understand. You have…

Create beautifully crafted PDFs with the jsPDF library, without the necessary struggle — Hey! 👊 I think that every programmer would agree that there’s nothing more frustrating than spending 10 hours on things that afterward take only 3 minutes. In this fast tutorial, I will showcase, how you can add images to PDF in two different ways. Why 2 different ways? Well, the way of adding differs…

Without a single line of Solidity or Rust code — What is Solana? While ETH was reaching new heights in terms of traffic, price, and dApps development, new blockchains have arisen to tackle some of Ethereum’s main problems. One of them is Solana, currently the 6th largest blockchain in terms of market valuation. Ethereum’s main problems are, of course, transaction speed and enormous…

Using Rarible API to fetch data fast and efficiently. — Rarible Multichain Protocol — Intro In the previous article, we showed you how to find NFTs you’re interested in, by using different searching parameters (such as collection, address, or user name) on a marketplace’s website. In general, that’s a very simple process…unless you want to fetch details from many different NFTs. In this article, we’ll…