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contract SelfDesctructionContract {
   public address owner;
   public string someValue;
   modifier ownerRestricted {
      require(owner == msg.sender);
      _;
   } 
   // constructor
   function SelfDesctructionContract() {
      owner = msg.sender;
   }
   // a simple setter function
   function setSomeValue(string value){
      someValue = value;
   } 
   // you can call it anything you want
   function destroyContract() ownerRestricted {
     suicide(owner);
   }
}

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contract CarShop {
   address[] carAssets;
   function createChildContract(string brand, string model) public payable {
      // insert check if the sent ether is enough to cover the car asset ...
      address newCarAsset = new CarAsset(brand, model, msg.sender);            
      carAssets.push(newCarAsset);   
   }
   function getDeployedChildContracts() public view returns (address[]) {
      return carAssets;
   }
}

contract CarAsset {
   string public brand;
   string public model;
   address public owner;
   function CarAsset(string _brand, string _model, address _owner) public {
      brand = _brand;
      model = _model;
      owner = _owner;
   }
}

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contract NameRegistry {
   struct ContractDetails {
      address owner;
      address contractAddress;
      uint16 version;
   }
   mapping(string => ContractDetails) registry;
   function registerName(string name, address addr, uint16 ver) returns (bool) {
      // versions should start from 1
      require(ver >= 1);
      
      ContractDetails memory info = registry[name];
      require(info.owner == msg.sender);
      // create info if it doesn't exist in the registry
       if (info.contractAddress == address(0)) {
          info = ContractDetails({
             owner: msg.sender,
             contractAddress: addr,
             version: ver
          });
       } else {
          info.version = ver;
          info.contractAddress = addr;
       }
       // update record in the registry
       registry[name] = info;
       return true;
   }
    function getContractDetails(string name) constant returns(address, uint16) {
      return (registry[name].contractAddress, registry[name].version);
   }
}

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contract MappingIterator {
   mapping(string => address) elements;
   string[] keys;
   function put(string key, address addr) returns (bool) {
      bool exists = elements[key] == address(0)
      if (!exists) {
         keys.push(key);
      }
      elements[key] = addr;
      return true;
    }
    function getKeyCount() constant returns (uint) {
       return keys.length;
    }
    function getElementAtIndex(uint index) returns (address) {
       return elements[keys[index]];
    }
    function getElement(string name) returns (address) {
       return elements[name];
    }
}

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contract WithdrawalContract {
   mapping(address => uint) buyers;
   function buy() payable {
      require(msg.value > 0);
      buyers[msg.sender] = msg.value;
   }
   function withdraw() {
      uint amount = buyers[msg.sender];
      require(amount > 0);
      buyers[msg.sender] = 0;      
      require(msg.sender.send(amount));
   }
}