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Re: Having to specify $_

by pg (Canon)
on Dec 09, 2002 at 06:11 UTC ( #218456=note: print w/replies, xml ) Need Help??


in reply to Having to specify $_

  1. $_ is also called $ARG if you 'use English;', what does the three letters 'ARG' mean? It means there are certain functions/operations, if you omit the arg, Perl will take $ARG as the default arg. In perlvar/$_, there is a complete list on this.

  2. $_ is also the place to store values, under specified situations. One example is, as stated in perlvar/$_:

    "The default place to put an input record when a <FH> operation's result is tested by itself as the sole criterion of a while test. Outside a while test, this will not happen."
Simple, that's it. Document, and again document. Perl does deliver what perlvar promised, but not those it never promised.

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