[Mapping -Solidity] #mapping

mapping.sol

Mapping Solidity : 

//Mapping is a key-value storage. They are also called dictionnary. 
// K -> V 
// address -> Balance
// so how do we defined a mapping ? 
//mapping (keyType => valueType) name; 
// Exemple : mapping(address => uint) balance; 

// Then, when we want to add a value to a mapping/a spefiic key we assign this value like this : 
// balance[address] = 10;
// If I want to retrieve this balance for this specific address :
// return balance [address];



pragma solidity 0.7.5; 

contract Bank {
    
mapping (address => uint) balance; //ligne de code à tapper pour le mapping 

    function addBalance(uint _toAdd) public returns(uint) { //fonction addBalance pour rajouter un uint à une address
        balance[msg.sender] += _toAdd; // ou aussi balance [msg.sender] + _toAdd
        return balance[msg.sender]; //on retourne balance [msg.sender] updaté
    
}

    function getBalance() public view returns(uint) {// fonction pour afficher une balance
        return balance[msg.sender];
    }
    
}