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- Subject: Re: ~= vs. !=
- From: Erik Hougaard <erik@...>
- Date: Thu, 27 Nov 2003 12:58:32 +0100
Roberto Ierusalimschy wrote:
Long ago when I started uCore the same discussion (!= vs ~=) lived but
with a twist.... cause the "~" is a dead key on a danish keyboard (and
lot of other European keyboard layouts) so is was a pain in the *** to
use it compared to the alternatives. But we learned to live with it and
when my staff ask "WHY???" - I just say "It's a funky brazillian thing
- just think of it as a exotic twist to a boring life in the cold north!
Why is the ~= operator the != operator in Lua in the first place? Perhaps
someone could share this bit of information?
First, `~=' is not the `!=' operator in Lua. `~=' is the "not equal"
Back in 1993 (when we started Lua) there was no Java, no Python (at
least to a general audience), no Php, Perl was known only to the
initiated. At that time, C-like syntax was not dominant as it is now.
Even today a lot of languages do not use `!=': Ada, Haskell, Eiffel, and
Fortran90 use `/='; Icon, Dylan, Smalltalk (and Lua) use `~='; several
Pascal-based languages use `<>'; Oberon, Modula2, and Modula3 use `#'.