Execute function based on screen size

Question

I need to execute a specific function based on screen size and screen size changes (Responsive)

So lets say I have 3 functions (For Example)

Answer 1

Meh; here's a solution.

You could cache the lastBoundry determined to invoke the functions only when a change occurs.

// define the boundries
var bounds = [
    {min:0,max:500,func:red},
    {min:501,max:850,func:orange},
    {min:851,func:green}
];

// define a resize function. use a closure for the lastBoundry determined.
var resizeFn = function(){
    var lastBoundry; // cache the last boundry used
    return function(){
        var width = window.innerWidth; // get the window's inner width
        var boundry, min, max;
        for(var i=0; i min && width < max 
               && lastBoundry !== boundry){
                lastBoundry = boundry;
                return boundry.func.call(boundry);            
            }
        }
    }
};
$(window).resize(resizeFn()); // bind the resize event handler
$(document).ready(function(){
    $(window).trigger('resize'); // on load, init the lastBoundry
});

Fiddle: http://jsfiddle.net/BaNRq/3/