Have a look at Promises or Observables.

On Tue, Jun 9, 2015 at 10:25 AM, Christopher Mina <
[email protected]> wrote:

> At what point outside of the redis callback are you checking the value of
> "len"?  As this, like most calls in JS, is async, you must wait for the
> call to complete and then notify your calling method via a callback
> function, watcher system, event system, etc. What you can't do is simply
> reference the Len value beneath your redis call and expect it to be set.
>
> Good luck
> Chris
>
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