API - allow ways to mute and umute callbacks

[jesseskinner]

Perhaps there should be some new API to enable muting and unmuting streams.

We can add these methods as properties of the function that gets returned from solve.

var randomNumberStream = solve(function (callback) {
        setInterval(function () {
            callback(Math.random());
        }, 500);
});

var logRandomNumbers = randomNumberStream(function (number) {
    console.log(number);
});

// stop logging
logRandomNumbers.mute();

// continue logging
logRandomNumbers.unmute();

// stop any listeners on any random number stream
randomNumberStream.mute();

[jesseskinner]

On second thought, it can be implemented from outside (without adding new API) using this technique. I always prefer to avoid API if possible.

function createMuteSolve(data) {
  var isMuted = false;

  var solver = solve(function (callback) {
    solve(data, function (result) {
      if (isMuted === false) {
        callback(result);
      }
    });
  });

  solver.mute = function() { isMuted = true; };
  solver.unmute = function() { isMuted = false; };

  return solver;
}

var solver = createMuteSolve({ data: getStuff });

// add callback
solver(function(result) { /* do stuff */ });

// mute callback
solver.mute();

// unmute callback
solver.unmute();