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+# After [![Build Status][1]][2]
+
+Invoke callback after n calls
+
+## Status: production ready
+
+## Example
+
+```js
+var after = require("after")
+var db = require("./db") // some db.
+
+var updateUser = function (req, res) {
+  // use after to run two tasks in parallel,
+  // namely get request body and get session
+  // then run updateUser with the results
+  var next = after(2, updateUser)
+  var results = {}
+  
+  getJSONBody(req, res, function (err, body) {
+    if (err) return next(err)
+    
+    results.body = body
+    next(null, results)
+  })
+  
+  getSessionUser(req, res, function (err, user) {
+    if (err) return next(err)
+    
+    results.user = user
+    next(null, results)
+  })
+  
+  // now do the thing!
+  function updateUser(err, result) {
+    if (err) {
+      res.statusCode = 500
+      return res.end("Unexpected Error")
+    }
+    
+    if (!result.user || result.user.role !== "admin") {
+      res.statusCode = 403
+      return res.end("Permission Denied")
+    }
+    
+    db.put("users:" + req.params.userId, result.body, function (err) {
+      if (err) {
+        res.statusCode = 500
+        return res.end("Unexpected Error")
+      }
+      
+      res.statusCode = 200
+      res.end("Ok")  
+    })   
+  }
+}
+```
+
+## Naive Example
+
+```js
+var after = require("after")
+    , next = after(3, logItWorks)
+
+next()
+next()
+next() // it works
+
+function logItWorks() {
+    console.log("it works!")
+}
+```
+
+## Example with error handling
+
+```js
+var after = require("after")
+    , next = after(3, logError)
+
+next()
+next(new Error("oops")) // logs oops
+next() // does nothing
+
+// This callback is only called once.
+// If there is an error the callback gets called immediately
+// this avoids the situation where errors get lost.
+function logError(err) {
+    console.log(err)
+}
+```
+
+## Installation
+
+`npm install after`
+
+## Tests
+
+`npm test`
+
+## Contributors
+
+ - Raynos
+ - defunctzombie
+
+## MIT Licenced
+
+  [1]: https://secure.travis-ci.org/Raynos/after.png
+  [2]: http://travis-ci.org/Raynos/after
+  [3]: http://raynos.org/blog/2/Flow-control-in-node.js
+  [4]: http://stackoverflow.com/questions/6852059/determining-the-end-of-asynchronous-operations-javascript/6852307#6852307
+  [5]: http://stackoverflow.com/questions/6869872/in-javascript-what-are-best-practices-for-executing-multiple-asynchronous-functi/6870031#6870031
+  [6]: http://stackoverflow.com/questions/6864397/javascript-performance-long-running-tasks/6889419#6889419
+  [7]: http://stackoverflow.com/questions/6597493/synchronous-database-queries-with-node-js/6620091#6620091
+  [8]: http://github.com/Raynos/iterators
+  [9]: http://github.com/Raynos/composite