I have a little code question for you.
*code:*
var EventEmitter = require('events').EventEmitter
function buildEmitters(name) {
var self = new EventEmitter
function sayWhat () {
self.emit('what')
}
self.on('what', function () {
console.log(name + ' says what')
})
function addGroup (group) {
self.on(group, function () {
console.log(name + ' was called by group, what')
})
}
function callGroup (group) {
self.emit(group, name)
}
self.sayWhat = sayWhat
self.addGroup = addGroup
self.callGroup = callGroup
return self
}
var A = buildEmitters('grep')
, B = buildEmitters('cat')
, C = buildEmitters('tar')
A.addGroup('wheel')
B.addGroup('wheel')
C.addGroup('wheel')
A.sayWhat()
B.sayWhat()
C.callGroup('wheel')
which outputs:
grep says what
cat says what
tar was called by group, what
I would like it to say:
grep says what
cat says what
tar was called by group, what
cat was called by group, what
grep was called by group, what
I know I can use the
if (!(this instanceof buildEmitters)) return new buildEmitters()
EventEmitter.call(this)
along with the
buildEmitters.prototype = new EventEmitter
and in the addGroup method:
buildEmitters.prototype.on(group, callback)
and in the callGroup method:
buildEmitters.prototype.emit(group)
pattern. It works, and it's used everywhere.
*problem:*
But I am attempting to write code without inheritance and prototype calls.
Zero.
Just clean and simple little objects.
*question:*
Is it possible to get 'events' to propagate between the objects that *
buildEmitters* creates? Any patterns, hacks or blatantly obvious
workarounds that I am missing?
Thanks!
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