[erlang-questions] separators before end
Wed Sep 19 19:07:15 CEST 2007
> The fact that Erlang doesn't *HAVE* statements. It only has
> expressions. What is the value of an empty expression?
> Where Erlang *does* need to allow extra semicolons is at the
> *beginnings* of ifs, cases, and receives, so you can write
> case e0 of
> ; p1 when g1 -> e1
> ; ...
> ; pn when gn -> en
> and be sure of having your punctuation right.
I prefer this, too.
[mailto:] On Behalf Of ok
Sent: Wednesday, September 19, 2007 01:00
To: Erlang-Questions (E-mail)
Subject: Re: [erlang-questions] separators before end
On 19 Sep 2007, at 3:33 pm, Doug Edmunds wrote:
> Can someone tell me why it would be so difficult for Erlang
> to allow commas and semi-colons before the word ''end"?
Syntactically it would be easy.
> If there is a syntax error waiting to happen it is doing
> a copy/paste that doesn't add or take away a comma or
This doesn't happen to me, but I'm not a *heavy* user of Erlang,
so evidence from people who are would be useful.
> What is so bad about having an empty statement?
The fact that Erlang doesn't *HAVE* statements. It only has
expressions. What is the value of an empty expression?
if ... -> E1, ; ... -> En, ; end
have the same value as
if ... -> E1 ; ... -> En end
and if so, how come the empty expression has so many different values?
If not, why not?
Where Erlang *does* need to allow extra semicolons is at the
*beginnings* of ifs, cases, and receives, so you can write
case e0 of
; p1 when g1 -> e1
; pn when gn -> en
and be sure of having your punctuation right.
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