Is there any difference between attaching callbacks or event listeners for child process in nodejs. like -
const execute = require('child-process').exec;
const process = execute('ping -n 1 www.google.com'); // or ping -c 1 www.google.com for mac
process.stdout.on('data', data => {
console.log(data)
})
In the above code, I am using an event listener for the output and I am getting stdout data in windows but can't get the output in macOS. But if I use callback like -
const execute = require('child-process').exec;
execute('ping -c 1 www.google.com', (error, stdout, stderr) => {
console.log(stdout);
})
I am getting the output data in both windows and mac. Is there any difference using callback or event listeners(both are asynchronous)?
The callback is called when the execution of that async task is completed. However, the events have to be fired based on the observer. Every event has listeners and when an event is fired its related listener function starts the executions.
You can check this link on stackoverflow for difference b/w callback and events.