title: How logic.js file work in Hyperledger Composer?
body: <p>In Hyperledger Composer, is <strong>logic.js</strong> related to <strong>Transaction</strong>?</p>
  
  <p>How to access list from <strong>logic.js</strong>?</p>
  
  <p>Have any good tutorial to understand what can I do in <strong>logic.js</strong> file?</p>