javascript_dynamic_fallbacks_invocation.js

// see it running at http://jsbin.com/qofozulihu/2/edit?js,console,output
// This gist is just an example idea of running functions and having fallbacks for them

fallbacks={
  one:function(){
    console.log('one');
    return false;
  },
  two:function(){
    console.log('two');
    return true;
  },
  three:function(){
    console.log('three');
    return false;
  }
};

function fallbacking(fallbacksObj){
  prevFallbackResult = false; //pre-declaring variable
  for (var index in fallbacksObj ){
    if(!prevFallbackResult){ // if method returns false then the loop continues to run/call the next methods until there's no other method to run or true is returned.
      prevFallbackResult = fallbacks[index]();
    }
  }
}

fallbacking(fallbacks); //run it 

// register another method
fallbacks.anotherFallback = function(){
  console.log('another one');
  return false;
};

// next run 
fallbacking(fallbacks);

// change the second fallback to return something
fallbacks.two = function(){
  console.log('stop there! I found it!');
  return true;
};


fallbacking(fallbacks); // run again


//do some transportation patching
fallbacks.last = fallbacks.two;
fallbacks.two = function(){
  console.log("Now I'm gonna fail!");
  return false;
};

fallbacking(fallbacks); // run again but patched

//do some monkey patching
oldThree = fallbacks.three;
fallbacks.three = function(){
  console.log('Before: I am a code Monkey!');
  oldThree();
  console.log('After: I am a code Monkey!');
};

fallbacking(fallbacks);