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June 24, 2019

List of Blockchain where Solidity can be used

Most people people know that Solidity can be used to develop Ethereum smart contracts. However, very few people also know that Solidity is also in a couple of other blockchain projects. In this article, I will tell you 3 other blockchain technologies where you can use Solidity to write smart…

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June 20, 2019

The Ultimate collection of Solidity Interview Questions | 100 questions

In this article you will find 100 questions to prepare your Solidity job interview. Questions are grouped into easy, intermediate and difficult categories. Easy Intermediate Difficult By the way, if you want to make sure you understand and remember all the questions / answers listed in this article, you need…

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June 17, 2019

Graph of memory locations in Solidity: storage, calldata, etc…

In Solidity smart contracts, there are 4 memory locations: storage memory stack calldata They all have different lifetimes and it's not always easy to choose which one is right. In the below graph I drew their lifetimes against the execution of blocks, smart contract and functions. Storage is the only…

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March 25, 2019

Solidity Tutorial: Complete Step-by-Step Guide For Beginners 2019

In this Solidity tutorial you are going to learn how to code Solidity smart contracts by developing 5 smart contracts on Ethereum, with step-by-step instructions. This tutorial is for total beginners to Ethereum and Solidity, and does not require to install any development tool. You only need a web browser.…

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March 24, 2019

ERC20 Token Tutorial: Create a custom token in Solidity

ERC20 tokens are a key component of many Ethereum Dapps. They usually represent some sort of ownership over a product, service or asset. They largest use case has been for ICOs but recently their use has been expended to other area like game assets for example. As an Ethereum /…

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February 26, 2019

Rock paper scissors Solidity tutorial

You know Rock paper scissors right? If you don't, that's a simple game where in each round 2 players make one of 3 moves: rock paper scissors Paper beats rock, scissors beat paper, and rock beats scissors. You can also bet money in each round, to make it more interesting.…

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February 24, 2019

Fomo3D Tutorial

Have you heard of Fomo3D? This is a famous lottery Dapp on Ethereum where the last player to invest in a round win the jackpot! By the way, don't freak out if you visit the page of Fomo3d and see references to "scam". This is just some provocative marketing. This…

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February 23, 2019

Lottery in Solidity

This video is a tutorial to build a lottery smart contract in Solidity. The rules are simples. In each round of the lottery, anybody can send Ether to the smart contract. When enough participants have sent their money, the lottery will determine a winner and send him/her a prize. The…

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February 21, 2019

Event organization smart contract

In this video, I will teach you how to build a smart contract to organize events.There will be 2 types of users: event organizers customers Event organizers will be able to organize events and sell tickets. Customers will be able to not only buy tickets from the event organizers but…

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February 19, 2019

Loan state machine in Solidity

In this video we will create a loan smart contract with Solidity. There will be 2 kind of parties interacting with the smart contract: investors borrowers The investor will send Ether at the beginning of the loan, and at the end the borrower will reimburse the investor of the initial…

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