The Curious Case of Coffeescript and Passport: Unusual Functions Attached

Recently, I've been experimenting with coffeescript, express, and passport. However, there are some aspects of the language that I'm having difficulty grasping.

Could someone please clarify what is happening in this scenario?

When I define the passport.serializeUser and passport.deserializeUser functions like this:

passport.serializeUser (user, done)->
  done null, user

passport.deserializeUser (obj, done)->
  done null, obj

everything works smoothly.

However, when I attempt to pass these functions from an external source using the following method, which seems identical to me, I encounter a TypeError. The error message states: "TypeError: object is not a function" when passport attempts to execute my deserialize function.

serialize = (user, done) ->
  done null, user

deserialize = (obj, done) ->
  done null, obj

passport.serializeUser = serialize
passport.deserializeUser = deserialize

I'm at a loss here. What could be causing the difference in behavior?

Answer №1

Here is the breakdown:

authenticate.authenticateUser(user, done)->
  done null, user

authenticate.authorizeUser(obj, done)->
  done null, obj

In this code snippet, the authenticateUser and authorizeUser functions of the authenticate object are being called with functions as arguments. This is equivalent to:

authFunc = (user, done) -> done(null, user)
authenticate.authenticateUser(authFunc)

authFunc2 = (obj, done) -> done(null, obj)
authenticate.authorizeUser(authFunc2)

These lines show that new functions are being assigned to the authenticate object's authenticateUser and authorizeUser properties.

Essentially, the first set of code is using functions as arguments when invoking functions, while the second set is replacing existing functions with new ones within an object.

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