A contract to understand Function Modifers

FunctionModifiers.sol

pragma solidity ^0.4.15;

//@Title to understand FunctionModifiers
//@Author Toniya <[email protected]>

// It changes the behaviour of the function 
//Eg Contract kill function should only be called by the admin
    
contract FunctionModifiers {
    
    address public creator;
    
    function FunctionModifiers() {
        creator = msg.sender;
    }
    
    //Defining the modifiers 
    modifier onlyCreator() {
        //If a condition is not met then throw error 
        if(msg.sender!=creator) throw;
        //Or just continue the excecution
        _;
    }
    
    function addNos(uint a,uint b) constant returns(uint sum) {
        sum = a+b;
        return sum;
    }
    
    // the below function should be allowed only by the creator 
    function kill() onlyCreator {
        selfdestruct(creator);
    }
}