In my code I often find structures of the form
while ( 1 ) {
# yadda yadda
last if some_condition();
# yadda yadda
}
which suggests to me that a better, more general design for a loop would put the test between "pre" and "post" blocks:
loop { # begin of enclosing block
# pre-test code
} while ( some_condition() ) {
# post-test code;
}
Both pre- and post-blocks get executed repeatedly until the test in the middle fails, at which point control passes to immediately after the post-block. The pre-block (together with the loop keyword) would be optional; omitting it results in the standard while-loop. Likewise, the post-block is optional; omitting produces the standard do-while loop.
But Perl already gives a pretty close approximation for the attractive low price of an end-of-block redo:
{
# pre-code
last if some_condition();
# post-code
redo;
}
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