03a_async_bad_arrow.js

var fs = require('fs');

var file;
var buf = new Buffer(100000);

fs.open('info.txt', 'r', (err, handle) => {
    file = handle;
});

fs.read(file, buf, 0, 100000, null, (err, length) => {
    console.log(buf.toString());
    fs.close(file, () => { /* don't care */ });
});