To begin with, I'm a noob to JavaScript. How do I add functionality to the main loop, or something similar?

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you mean how to add conditional statements to a loop? For example:

var test = 'oranges';

['apples', 'oranges', 'mango'].forEach(function (elem, index) {

    // conditional statement
    if (elem == 'oranges') {
        console.log('Chosen element: ' + elem);

    // default condition
    else {
        console.log('Something else.');
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I'm trying to find a way to add functionality to Java Script's main event loop, from which the all its events are evaluated.

For example,

//every event based application has something similar at heart,
//usually, somewhere in the main function
 //process all events
 AbstractEvent **a = eventStack.begin()-1;
  application.processEvent(*a); //could be an "onclick","onmouseenter", exit, etc...
  //for Java Script, can I make stuff happen here

 //or here?
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