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    <p>This could be a possible solution:</p> <ul> <li>wrap all the foreign code into a class</li> <li>make all the undeclared identifiers members of that class</li> <li>before invoking the messy code, make a copy of the built-in classes and name them differently <br/> (is this possible??).</li> </ul> <p>I think this should solve all the problems.</p> <p>With my suggestion, your sample</p> <pre><code>var badA = "hahaha"; this.badB = "hehehe"; badC = "hohoho"; String.prototype.star = function(){ return '***' + this + '***' } var somethingUseful = { doStuff: function () { alert((badA + badB + badC).star()); } } </code></pre> <p>should get like this</p> <pre><code>// Identifies the added properties to prototypes (ie String and Function) // for later filtering if you need a for-in loop. var stringAddons = []; var functionAddons = [] var _string = new String(); var _function = function() {}; for (var property in _string) { if (!_string.hasOwnProperty(property)) { stringAddons.push(property); }} for (var property in _function) { if (!_function.hasOwnProperty(property)) { functionAddons.push(property); }} // Wraps the undeclared identifiers var global = function() { this.badA = "hahaha"; this.badB = "hehehe"; this.badC = "hohoho"; String.prototype.star = function(){ return '***' + this + '***' } this.somethingUseful = { doStuff: function () { alert((global.badA + global.badB + global.badC).star()); } } } var global = new Global(); global.somethingUseful.doStuff(); </code></pre> <p>The tricky part is making ALL the undeclared identifiers <em>global</em> properties. Maybe a good regex script could make it. Im not that good with regex :)</p>
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    1. POAvoiding pollution of globals via iframe script loader?
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    1. USGabriel
    1. USGabriel
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      1. VTUpMod
    1. COTried the same.. putting foreign code in a function gets rid of messy globals in foreign code, but prototype methods is still a problem. Cant make copies of Array, String as far as i know.. will put in code in separate answer...
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      1. USRavindra Sane
    2. COThis also doesn't help if values are assigned to identifiers without using the `var` keyword... see `badC` in my example... you can wrap it in a function but you'll still have `window.badC`.
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      1. USDagg Nabbit
    3. COwindow.open?... load your helper js in the new window and have it collate all the objects/methods and stuff them into an object. then from that JS, cose the window and return the object. (it would be annoying from a user's perspective and with all those popup blockers, may or may not work) too late here to give it a try. Your thoughts? Feasible?
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      1. USRavindra Sane
 

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