Created
November 13, 2019 14:13
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Simple PubSub implementation with JavaScript - by Addy Osmani
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var pubsub = {}; | |
(function(q) { | |
var topics = {}, subUid = -1; | |
q.subscribe = function(topic, func) { | |
if (!topics[topic]) { | |
topics[topic] = []; | |
} | |
var token = (++subUid).toString(); | |
topics[topic].push({ | |
token: token, | |
func: func | |
}); | |
return token; | |
}; | |
q.publish = function(topic, args) { | |
if (!topics[topic]) { | |
return false; | |
} | |
setTimeout(function() { | |
var subscribers = topics[topic], | |
len = subscribers ? subscribers.length : 0; | |
while (len--) { | |
subscribers[len].func(topic, args); | |
} | |
}, 0); | |
return true; | |
}; | |
q.unsubscribe = function(token) { | |
for (var m in topics) { | |
if (topics[m]) { | |
for (var i = 0, j = topics[m].length; i < j; i++) { | |
if (topics[m][i].token === token) { | |
topics[m].splice(i, 1); | |
return token; | |
} | |
} | |
} | |
} | |
return false; | |
}; | |
}(pubsub)); |
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