Solidity Programming Tutorials, Guides & Best Practices

Mappings are key-value stores, often used to associate addresses with balances.

mapping(address => uint) public balances;

function updateBalance(address _address, uint _amount) public {
    balances[_address] = _amount;
}

function getBalance(address _address) public view returns (uint) {
    return balances[_address];
}