Solidity struct array

Question

I'm running into a problem with solidity with structures containing arrays, can you help me see what I'm missing?Any help would be greatly appreciated!

 struct Info {
    uint a;
    uint256 b;
    uint[] data;
}

mapping(address => Info) infos;

function set() public {
    infos[msg.sender].a = 1;
    infos[msg.sender].b = 2;
    infos[msg.sender].data.push(3);
}

function get() public {
      infos[msg.sender].a; //yes It is equal to 1
      infos[msg.sender].b; //yes It is equal to 2
      infos[msg.sender].data[0]; //The problem here is that anyone calling this function can read data[0]=3
}

Answer 1

So this works as you said. you pushed value 3 to the array and it returns value 3 at 0 index of the array. if you want data array has 3 elements you should push 3 times a value maybe 0.