title: How to access the contents of the closure from the outside
body: <p>I use the following code to read the file line by line.
  But the content of the line is in a closure, what can I do to access the contents of the line outside?The module I am using is the internal module of node.js</p>
  
  <pre><code>  var fs=require("fs")
   function readFirstLine(){
      var firstfile = [];
      readline = require('readline');
  
      var rd = readline.createInterface({
          input: fs.createReadStream('somefile.txt'),
          output: process.stdout,
          terminal: false
      });
  
      rd.on('line', function(line) {
          console.log(line)  
      }
      );
  
  }
      readFirstLine()
  </code></pre>