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PORemove and add elements to functions argument list in javascript
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  1. PORemove and add elements to functions argument list in javascript
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    copied!<p>I have written an observer in javascript. You can trigger Events like this:</p> <pre><code>ClassThatExtendsEvent.triggerEvent('EventName', arg1, arg2, ..., argn) </code></pre> <p>There is a variable number of arguments, with the first argument being the event name. I do as well have subscribers, that are saved in a private property of my event class. They are getting called like this:</p> <pre><code>Event.prototype.triggerEvent = function() { var callbacks = this._events[eventName]; if(callbacks !== undefined) { for (var i = 0, l = callbacks.length; i &lt; l; i++) { // I do not need the first argument here!!! callbacks[i].apply(callbacks[i], arguments); } } } </code></pre> <p>However, the subscribers do know the event name, hence it could be ommitted. But I do not know, how to remove one argument from the list (as it's not an array but seems to be some kind of object).</p> <p>I also need to readd the event name, once it's been deleted, because after notfiying the direct subscribers, a global event system kicks in. This global event system needs the name.</p> <p>Hence the entire function looks like this:</p> <pre><code>Event.prototype.triggerEvent = function() { // First we deliver to direct subscribers var callbacks = this._events[eventName]; if(callbacks !== undefined) { for (var i = 0, l = callbacks.length; i &lt; l; i++) { // I do NOT need the first argument here!!! callbacks[i].apply(callbacks[i], arguments); } } // Now we broadcast the event to the entire system // I DO need the first argument here!!! Facade.getInstance().broadcastEvent.apply(Facade.getInstance(), arguments); } </code></pre> <p>How would you implement this?</p>
 

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