Meaning of [a]++b
Thu Jan 16 20:03:36 CET 2003
Eric Newhuis writes:
> Can someone provide or point me in the direction of an explanation of
> what this means?
> > [a] ++ b
> Is this a quirk that has a useful side-effect that is a feature? Or was
> this an intentional feature from the beginning? It reminds me of
> something I saw in Lisp, the dot operator or something. My memory fails
Since you appear to be familiar with Lisp, take a look at
[a|b] is Erlang notation for a cons cell. You can implement many data
structures using a cons cell, including linked lists. The ++ operator
is intended for concatenating lists, but it happens to work for some
other arguments too. Try writing an 'append' function by hand and
you'll see why. I'd call it a quirk, though a well-defined one.
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