Thus in the loop while (my $line = <>) { $line = lc $line; } continue { print $line; } the scope of $line extends from its declaration throughout the rest of the loop construct (including the "continue" clause),
The"while"statement executes the block as long as the expression is true. The"until"statement executes the block as long as the expression is false. TheLABELis optional, and if present, consists of an identifier followed by a colon. TheLABELidentifies the loop for the loop control statements"...
There was a time in very early Unicode releases when "\p{Hebrew}" would have matched the block Hebrew; now it doesn't. Some people just prefer to always use "\p{Block: foo}" and "\p{Script: bar}" instead of the shortcuts, for clarity, and because they can't remember the ...
Perl 诊断消息 类别含义 (W)警告(可选) (D)反对(可选) (S)严重警告(必需) (F)致命错误(可捕获) (P)你应该从未见过的内部错误(恐慌性的)(可捕获) (X)非常致命的错误(不可捕获) (A)外来错误消息(不是Perl生成的)
Option names may be terminated early as long as they are uniquely identified. For example, instead of--dump-token-types, it would be sufficient to enter--dump-tok, or even--dump-t, to uniquely identify this command. I/O control
TheLASTdirective can be used to prematurely exit aFOREACHorWHILEloop: [% FOREACH user = userlist %] Name: [% user.name %] Email: [% user.email %] [% LAST IF some.condition %] [% END %] BREAKcanalso be used as an aliasforLAST. ...
wish Larry Wall would get to the point already know how to program in general terms don't care about Perl beyond what's necessary to get the job done. This document is intended to be as short as possible, but no shorter. Preliminary notes ...
This method is designed to be used in a while loop, reading $maxlength bytes on every call. $maxlength defaults to the size of the request if not specified.You have to set MyApp->config(parse_on_demand => 1) to use this directly....
# However while exit exits the thread, glutLeaveMainLoop only sets a flag for # the event loop, thus we must take care to return when using it. Additionally # any use of quit() ALSO needs to return. # # return quit(); # sub quit { my ($context) = @_; $context ||= "<unknow...
Place the following code in front of the while loop that’s collapsing whitespace: my $pid = open(STDOUT, "|-"); die "cannot fork: $!" unless defined $pid; unless ($pid) { # child while (<STDIN>) { s/ $//; print; } exit; }...