parallel execution and scope isolation in JavaScript

parallel_exec_in_js.js

// functionality is broken across many code snippets wrapped in a function
var array_of_functions = [
    function() {
        // do something 1
    }, 
    function() {
        // do something 2
    },
    function() {
        // do something 3
    },
    function() {
        // do something 4
    }
];    

// Start executing the snippets immediately with a 25 ms lag between each snippet.
setTimeout(function() {
    // Get the first code snippet and remove it from the array
    var item = array_of_functions.shift();
    // execute the next code snippet after 25 ms from now
    if (array_of_functions.length > 0) {
        setTimeout(arguments.callee, 25);
    }
    // if the item isn't undefined, execute it
    if(item){
        item.call();
    }
}, 0);