Blockchain Development Programming Tutorials, Guides & Best Practices

Libraries are similar to contracts but are meant to hold reusable code. They cannot hold state.

library Math {
    function add(uint a, uint b) internal pure returns (uint) {
        return a + b;
    }
}

contract MyContract {
    using Math for uint;

    function calculate(uint a, uint b) public pure returns (uint) {
        return a.add(b);
    }
}