Contracts in Solidity are similar to classes in object-oriented languages. They contain persistent data in state variables and functions that can modify these variables. Calling a function on a different contract instance will perform an EVM function call and thus switch the context such that state variables are inaccessible. As of today it has a method called web3. Contract to facilitate contract creation. When a contract is created, its constructor a function declared with the constructor keyword is executed once. A constructor is optional.

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