atom-nuclide/pkg/nuclide-debugger-node/VendorLib/node-inspector/lib/callback.js

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/**
 * Create a callback container
 * @return {Object} that wraps callbacks and returns a one-time id.
 */
exports.create = function() {
  var lastId = 1,
      callbacks = {};

  return Object.create({}, {
    wrap: {
      value: function(callback) {
        var callbackId = lastId++;
        callbacks[callbackId] = callback || function() {};
        return callbackId;
      }
    },
    processResponse: {
      value: function(callbackId, args) {
        var callback = callbacks[callbackId];

        if (callback) {
          callback.apply(null, args);
        }

        delete callbacks[callbackId];
      }
    },
    removeResponseCallbackEntry: {
      value: function(callbackId) {
        delete callbacks[callbackId];
      }
    }
  });
};