I have just started learning Node.js and was wondering if I misunderstood the code's intent,I thought the code shown below will print 'file opened' in the terminal or command prompt only when I open that text file but after I initiated the Node.js file, 'file opened' already appeared before opening the text file.
var fs = require('fs');
var readStream = fs.createReadStream('./new1.txt')
readStream.on('open', function(){console.log("file opened")})
Let's go step by step so you can understand what's going on with your code and how Node.js works.
Here you will import the filesystem module into your code
var fs = require('fs');
Then you're using the createReadStream method from fs. Basically, it will create a readable stream object. You can get more info here
var readStream = fs.createReadStream('./new1.txt')
Finally, you need to know that Node.js is event-driven. It means that you can know when something is done "Let me know when it's ready" In this case, you're listening to the event 'open' so whenever ReadStream open the file (in your case new1.txt) it will let you know. The 'open' event doesn't mean that you need to open the file manually.
readStream.on('open', function(){console.log("file opened")})
