[erlang-questions] Irregular list

[Ladvánszky Károly]

Just getting acquainted with this wonderful system, I’ve run into the
following issue:

 

The shell seems to accept a structure like this: [a | b].

 

is_list([a | b]) returns true but length([a | b]) raises an exception.

 

Is it like an “open list” found in some programming languages?

 

 

 

Any help would be appreciated,

 

LKaroly

 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://erlang.org/pipermail/erlang-questions/attachments/20090212/27fe5313/attachment.htm>