Geth - reading public address[] from contract

Question

After setting up testrpc and attaching geth:

testrpc -a 10
geth attach rpc:http://localhost:8545

I initialise the following contract on the geth command line:

pragma solidity ^0.4.6;
contract AddressList {  
    event addressregistered(address addy);

    uint public NoMembers; 
    address[] public MemberAddresses;

    function registerAddress() { 
        MemberAddresses.push(msg.sender);    
        NoMembers = MemberAddresses.length;    
        addressregistered(msg.sender);
        }  
}

var addresslistContract = web3.eth.contract([{"constant":false,"inputs":[],"name":"registerAddress","outputs":[],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"NoMembers","outputs":[{"name":"","type":"uint256"}],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"","type":"uint256"}],"name":"MemberAddresses","outputs":[{"name":"","type":"address"}],"payable":false,"type":"function"},{"anonymous":false,"inputs":[{"indexed":false,"name":"addy","type":"address"}],"name":"addressregistered","type":"event"}]);
var addresslist = addresslistContract.new(
   {
     from: web3.eth.accounts[0], 
     data: '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', 
     gas: '4700000'
   }, function (e, contract){
    console.log(e, contract);
    if (typeof contract.address !== 'undefined') {
         console.log('Contract mined! address: ' + contract.address + ' transactionHash: ' + contract.transactionHash);
    }
 })

I then store 10 addresses:

for (var x = 0; x < 10; x++){
    addresslist.registerAddress({from:eth.accounts[x],gas:3000000}) 
}

Finally I attempt to read the MemberAddresses list:

> addresslist.MemberAddresses()
"0x50522be14817f1e774e9077f58e7ef4f8d50137f"

As you can see, it returns a single address; the first element. If I pass a number it will return that element. I'd like a list. Can I return all array elements without a loop, on the geth console?

Answer 1

You can just add a getter function

function getAddresses() constant returns (address[]){
    return MemberAddresses;      
}

Less importantly, convention is to camelCase variables, and capitalize events:

event AddressRegistered(address addy);

uint public noMembers; 
address[] public memberAddresses;

Note that other contracts will not be able to use this function, since dynamic return sizes are not supported in the EVM. You will still be able to use it from web3, though.