1function firstFunction(_callback) {
2    // do some asynchronous work
3    // and when the asynchronous stuff is complete
4    const fs = require('fs');
5    let jsonData;
6    fs.readFile("industriesByCat.txt", 'utf8', function (err, data) {
7        if (err) throw err;
8        jsonData = JSON.parse(data);
9        console.log(jsonData);
10      	
11      	//This is important for callback
12        _callback();
13    });
14
15}
16
17function secondFunction() {
18    // call first function and pass in a callback function which
19    // first function runs when it has completed
20    firstFunction(function () {
21        console.log('huzzah, I\'m done!');
22    });
23}
24secondFunction();
25