in reply to Different result for 'foreach' vs 'while shift' arrayref

Incidentally, is there documentation of the behavior of foreach if the contents of the array are volatile during the loop?   And of unshift vs. push in such a frightful but-it-happens scenario?

Replies are listed 'Best First'.
Re^2: Different result for 'foreach' vs 'while shift' arrayref
by kcott (Archbishop) on Apr 19, 2014 at 06:47 UTC

    Yes. See the "Foreach Loops" section of "perlsyn - Perl syntax":

    "If any part of LIST is an array, foreach will get very confused if you add or remove elements within the loop body, for example with splice. So don't do that."

    -- Ken

[reply]
[d/l]
[select]

In Section Seekers of Perl Wisdom