looseCouplingSample.js

const account = {
    balance: 0
};
const  accountProcesses= {};

// Account processes - as many as we want
accountProcesses.deposit = {
    process:(amount)=>{
        account.balance += amount;
    }
};

accountProcesses.withdraw = {
    process:(amount)=>{
        account.balance -= amount;
    }
};

function doProcess(processType, amount) {
    processType?.process(amount);
    return account.balance;
}

console.log(doProcess(accountProcesses.deposit, 100));