Javascript return value from nested function prints undefined

Question

Here i'm trying to return value from bcrypt.compare, nested inside a function.

I want to get the result value (true or false).

Im using coffeescript. Here is the code:

comparePasswordWithHash = (pass, hash) ->

  return bcrypt.compare pass, hash, (err, result) ->

    if err

      throw err

    else

      return result



console.log comparePasswordWithHash "bacon", hashedPassword # Should print true/false

With this code, value printed is undefined.

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Answer 1

bcrypt.compare() is asynchronous. This means that it is not returning anything, but instead calls the callback you pass to it. There is also a sync version of compare() --> bcrypt.compareSync().

My coffeescript is a little rusty, but I think you would end up with something like this using the promise:

comparePasswordWithHash = (pass, hash) -> bcrypt.compare pass, hash

comparePasswordWithHash "bacon", hashedPassword
.then (response) ->  console.log response
.catch (error) -> console.log error

Javascript return value from nested function prints undefined

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