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Subject: newbie question
From: lalawawa <usenet@ j i o
Date: Wed, 9 Jun 2010 15:45:25 +0900

In perl, one is able to sort of 'declare' variables by mentioning them
in 'my' statements.  Then, if you say 'use strict;', no variables that
weren't previously thus 'declared' are allowed.  This is useful in that
it catches typos that might be difficult to detect in testing.

Does ruby have an equivalent mechanism?