[erlang-questions] question about erlang doc

Jim <>
Sun Dec 16 17:51:08 CET 2012


I believe this is a type specification indicating that the function seed/1 takes a parameter X1 of type (that's what the :: means) 3-tuple ({A1, A2, A3}) and returns (indicated by the ->) undefined or a random number (whatever ran/0 indicates).

Notice that A1, A2, A3 are further specified to be integers in the lines below. 


Sent from my iPad

On Dec 16, 2012, at 11:35 AM, Rustom Mody <> wrote:

> In http://www.erlang.org/doc/man/random.html I see this line:
> 
> seed(X1 :: {A1, A2, A3}) -> undefined | ran()
> 
> Whats the '::' ?
> Also I cant figure out how to read what follows the '->'
> 
> Please note I am not so much interested in the specifics of random numbers as in being able to read the manual!
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