Dynamically loading JavaScript synchronously

Question

I\'m using the module pattern, one of the things I want to do is dynamically include an external JavaScript file, execute the file, and then use the functions/variables in t

Answer 1

The most Node.js-like implementation I could come up with was able to load JS files synchonously, and use them as objects/modules

var scriptCache = [];
var paths = [];
function Import(path)
{
    var index = 0;
    if((index = paths.indexOf(path)) != -1) //If we already imported this module
    {
        return scriptCache [index];
    }

    var request, script, source;
    var fullPath = window.location.protocol + '//' + window.location.host + '/' + path;

    request = new XMLHttpRequest();
    request.open('GET', fullPath, false);
    request.send();

    source = request.responseText;

    var module = (function concealedEval() {
        eval(source);
        return exports;
    })();

    scriptCache.push(module);
    paths.push(path);

    return module;
}

An example source (addobjects.js):

function AddTwoObjects(a, b)
{
    return a + b;
}

this.exports = AddTwoObjects;

And use it like this:

var AddTwoObjects = Import('addobjects.js');
alert(AddTwoObjects(3, 4)); //7
//or even like this:
alert(Import('addobjects.js')(3, 4)); //7