conditionally executing a callback

asynchronous, callback, control-flow, node.js

Solution

No great solution to this; the best I've found is to make a local function that takes care of the remaining common work like this:

http.createServer(function (req, res) {
  getSomeData(client, function(someData) {
    function getMoreAndEnd() {
       getMoreData(client, function(moreData) {
         res.end();
       });
    }

    if (someData) {  
      getSomeOtherData(client, function(someOtherData) {
        getMoreAndEnd();
      });
    } else {
      getMoreAndEnd();
    }
  });
});

Problem

What's the best way to solve the following control flow niggle: I only want to call `getSomeOtherData` if `someData` is equal to some value / passes some conditional test In both cases I always want to call `getMoreData` ``` http.createServer(function (req, res) { getSomeData(client, function(someData) { // Only call getSomeOtherData if someData passes some conditional test getSomeOtherData(client, function(someOtherData) { // Always call getMoreData getMoreData(client, function(moreData) { res.end(); }); }); }); }); ```

Original source