Address is a special data type in Solidity that holds a 20-byte value, and provides built-in functions like transfer and balance. Here are the notable features you would find when you learn solidity. The Solidity Constructor¶. In Solidity, an array can be of compile-time fixed size or of dynamic size. Basic Solidity Programming In Solidity, you might want to use the factory pattern for one of the following reasons: If you want to create multiple instances of the same contract and youâre looking for a way to keep track of them and make their management easier. Whisper PoC 2 Protocol Spec. Solidity is a curly-bracket language designed to target the Ethereum Virtual Machine (EVM). In above example, we're storing sender address using msg.sender, who is supposed to execute the function getCallerAddress. Solidity is an object-oriented, high-level language for developing dApps (Decentralized applications), on the Ethereum blockchain.. A blockchain is a peer-to-peer network of computers, called nodes, that share all the data and the code in the network. Arrays in Solidity Arrays Solidity - Constructors Comments // one liner /* multi liner */ /// Natspec one liner /** Natspec multi liner **/ Natspec is Doxygen-like syntax for documenting functions, arguments etc. If you want to pass a dynamic array into a function you have to create a variable for it. constructor This is a variable named players, that references a dynamic array of addresses, which also has public access, so other smart contracts or apis can read the participants in the lottery contest. solidity initialize array in constructor