[erlang-questions] What does it mean when an evaluated expression is a list that contains the pipe character?

Gordon Guthrie gguthrie@REDACTED
Tue Feb 24 16:53:21 CET 2015


In case you are uncertain as to what that means - here is a wee primer:

http://stackoverflow.com/questions/1919097/functional-programming-what-is-an-improper-list <http://stackoverflow.com/questions/1919097/functional-programming-what-is-an-improper-list>


> Le 24 févr. 2015 à 15:37, Cole Fichter <cole.fichter@REDACTED> a écrit :
> I came across the example:
> > [1,2|3].
> [1,2|3]
> I understand that the pipe character, |, can be used to append an item to the head of the list or to pop an item off the list in a pattern match.
> But what exactly is happening in the example above? Why does the evaluated expression still contain the pipe?
> My best guess is that the final expression results in a match specification that could be used in a pattern match. However, that seems strange too because if so, we'd be popping two items off the list, which should be illegal.
> Can someone shed some light?
> Thanks!
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