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Re^3: Iterator to parse multiline string with \\n terminator

by smls (Friar)
on Oct 06, 2013 at 11:47 UTC ( #1057141=note: print w/replies, xml ) Need Help??

in reply to Re^2: Iterator to parse multiline string with \\n terminator
in thread Iterator to parse multiline string with \\n terminator

The difference is that redo does not re-evaluate the loop condition (in this case: "(<DATA>)", which fetches the next line) before evaluating the loop body again, whereas next does.

This is why in jwkrahn's solution, the next line is fetched manually before calling redo:

$_ .= <$fh>;

The advantage of jwkrahn's solution with redo, is that the implicit variable $_ can be used to store the complete multiline record.

The advantage of kcott's solution with next, is that there is only one place where the <> operator for fetching the next line is used (inside the loop condition) - but re-evaluating the the loop condition also resets $_, so in this case a custom variable needs to be declared above the loop to store the current record.

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