I want to run a code which will be called only once for an event. So, what will be the correct option(s)?
Option 1:
var EventSource = require("eventsource");
const source = new EventSource();
let callindex = 0;
source.once('event', () =>{
console.log("called");
});
source.emit('event');
Option 2:
var EventSource = require("eventsource");
const source = new EventSource();
let callindex = 0;
source.on('event', () =>{
if(callindex == 0){
console.log("called");
}
});
source.emit('event');
Option 3:
var EventSource = require("eventsource");
const source = new EventSource();
let callindex = 0;
source.on('event', () =>{
if(callindex == 0){
console.log("called");
}
callindex++;
});
source.emit('event');
Option 4
var EventSource = require("eventsource");
const source = new EventSource();
let callindex = 0;
source.on('event', () =>{
console.log("called");
source.removeAllListeners('event');
});
source.emit('event');
Why do you need to use something like EventSource? Wouldn't standard Node suffice?
const handleCustomApplicationEvent = () => {
console.log('hello');
window.removeEventListener('application:event', handleCustomApplicationEvent, true);
}
window.addEventListener('application:event', handleCustomApplicationEvent, true);
/** trigger it */
const event = new CustomEvent('application:event');
window.dispatchEvent(event);
const event2 = new CustomEvent('application:event');
window.dispatchEvent(event2);
Notice that event2 will not be caught
---------------------- Edit ----------------------
The answer from @callmenikk is even better.