dreddit-tutorial/contracts/DReddit.sol

pragma solidity ^0.5.0;

contract DReddit {

  struct Post {
    uint creationDate;   
    bytes description;   
    address owner;
  }

  Post [] public posts;

  event NewPost(
    uint indexed postId,
    address owner,
    bytes description
  );

  function createPost(bytes memory _description) public {
    uint postId = posts.length++;

    posts[postId] = Post({
      creationDate: block.timestamp,
      description: _description,
      owner: msg.sender
    });

    emit NewPost(postId, msg.sender, _description);
  }
}