Pass code to function by parameter

[keyboard]

Hey everyone,

  function setTimer( remain, actions ) {
    (function countdown() {
       display("countdown", toMinuteAndSecond(remain));         
       actions[remain] && actions[remain]();
       (remain -= 1) >= 0 && setTimeout(arguments.callee, 1000);
    })();
  }

  setTimer(userInput, {
    10: function () { display("notifier", "Just 10 seconds to go"); },
     5: function () { display("notifier", "5 seconds left");        },
     0: function () { display("notifier", "Time is up");       }
  });

When this code calls the function setTimer(), the second parameter is all that code.
What are they doing with all 10: 5: and 0: and how does actions[remain] && actions[remain](); work?
I'm sorry if I wasn't clear.

[jscheuer1]

actions is an object:

{
    10: function () { display("notifier", "Just 10 seconds to go"); },
     5: function () { display("notifier", "5 seconds left");        },
     0: function () { display("notifier", "Time is up");       }
  }

remain is expected to be a number, potentially one of the keys (10, 5, or, 0) in the action object.

actions[remain] is the first half of an && statement is used there as a boolean. There either is one or there isn't. If it is there however, it's expected to be a function. If there is then (&&) it's executed:

actions[remain]();

If it's not there, the first part of the && statement is false, so the second part isn't considered.

So let's say remain started as 10. This would be true and would execute:

10: function () { display("notifier", "Just 10 seconds to go"); },

[keyboard]

This really helped, thanks!