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var EventEmitter = require('events').EventEmitter
function Counter () {
EventEmitter.call(this)
this.value = 0
}
Counter.prototype = Object.create(EventEmitter.prototype)
Counter.prototype.increment = function increment () {
this.value++
}
Counter.prototype.decrement = function decrement () {
if (--this.value === 0) this.emit('zero')
}
Counter.prototype.isZero = function isZero () {
return (this.value === 0)
}
Counter.prototype.onceZero = function onceZero (fn) {
if (this.isZero()) return fn()
this.once('zero', fn)
}
module.exports = Counter