Javascript is the perfect language for dispatch tables

switchy.js

/* Why would you ever need a switch statement in javascript? */

var switchy = {
   1: function(x){ return x*x; },
   pizza: function(x){ return x*x*X }
};

var bar = switchy[foo](10);
   
// what if you could extend it with regex?

function switchy(cases){
    this.cases = cases;
    return function(match){
        if(match instanceof Regexp){
            for(var i in cases){ if(match.test(cases[i])){ return cases[i]; } };
        } else {
            return cases[match];
    }
};