before filter for js functions

before_after.js

function sample(a, b){
  return console.log(a + b);
}

function argless(){
  console.log("Argless lol");
}

function before(foo, filter, args){
  return function(){
      filter();
      return foo.apply(foo, args);
  }
}

function after(foo, filter, args){
  return function(){
    var result = foo.apply(foo, args);
    filter();
    return result;
  }
}

var f = before(argless, function(){ console.log("before"); });
f = before(f, function(){ console.log("beforer then before"); });
f = after(f, function(){ console.log("after");} );
f = before(f, function(){ console.log("before between afters chain")});
f = after(f, function(){ console.log("afterer");} );
f = before(f, function(){ console.log("beforeer then beforer then before"); });

f();

var k = before(sample, function(){console.log("before");}, [1,2]);
k();


// add bindings
// make it more reliable for exceptions
// enjoy