The Changes I'm Making To My Array Inside Linereader.on Are Not Available Outside

I'm parsing a data file (which contains json data) line-by-line and creating objects. I then add these objects to an array which I have declared outside. But for some reason, my 's

Solution 1:

You need to listen to the readline'close' event and then print the array. close will be called once all lines have been read.

lineReader.on('close', function() {
   console.log(services)
});

You'll then end up with something like:

const getSystem = function () {
    const lineReader = getLineReader();
    const services = [];

    lineReader.on('line', function (line) {
        const serviceJSON = JSON.parse(line);
        const tests = serviceJSON.tests.map(test => {
            returnnewServiceTest(
            test.id,
            test.name,
            test.criticality);
        });

        const service = newNewService(newUniqueID(), serviceJSON.name, tests, newTimestamp());

        services.push(service);
        console.log(services); // prints Services { _services: [relevant data here] }
    });

    lineReader.on('close', function() {
        console.log(services)
    });
}

In your current code, console.log(services) will fire before the line lineReader.on('line', ...) code.