We recently set up this Medium publication with several goals in mind: Keep track of the rapidly changing blockchain industry and share what’s happening there in a digestible structure Form a writing habit This is the very first story of Onchain, rather casual. The main purpose of posting this simple…

Disciples of progress do not share this defeatist attitude. For men of science, death is not an inevitable destiny, but merely a technical problem. People die not because the gods decreed it, but due to various technical failures — a heart attack, cancer, an infection. And every technical problem has…

Tony Hoare developed this algorithm when he was a visiting student at Moscow State University. It selects a pivot, partitions the array into two, and repeats this process recursively. It’s alternatively called the partition-switcher algorithm for this reason. UCL version Shuffle the array first to randomly distribute the elements Partition the array…

Token You can think of it as a crypto asset. NFT is also a token. A token is one of the smart contracts that follow some common rules. This introduces us to a useful feature: we can effortlessly interact with any tokens that follow the same protocol. Let me borrow some…

Immutability of Contacts The essential nature of Ethereum’s Smart Contracts is immutability. Once the contract is deployed, it can never be modified again. This is an intended feature, not a bug. It is a security measure to ensure that no one can tamper with the original contract, not even the creator himself. When…

Priority Queue An ordinary queue follows FIFO — the first element to be inserted comes out first. A priority queue introduces the idea of priority which is attached to each item. It contains items that are ordered by priority. Why use it? Let’s say that we have a continuous stream of inputs and we’d like…

Solidity Basics Define a function A function looks like this: function name(string memory _var1, uint _var2) function name() public pure returns (uint) function _name() private view pure means we don’t access any states in the contract. view means we don’t update the state but only view it. It’s a convention to put _ before private…

Define a function A function looks like this: function name(string memory _var1, uint _var2) function name() public pure returns (uint) function _name() private view pure means we don’t access any states in the contract. view means we don’t update the state but only view it. It’s a convention to put _ before private…