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| author | abela@geneanet.org <abela@geneanet.org> | 2001-03-06 10:40:36 +0100 |
|---|---|---|
| committer | Jarkko Hietaniemi <jhi@iki.fi> | 2001-03-07 15:04:58 +0000 |
| commit | b78df5de4cbb361d400476487114def2ea80ea60 (patch) | |
| tree | 7a25e0e4ad2cb3dcb2f3eed170ea83ff8d492f70 /pod/perlsyn.pod | |
| parent | 910e2c00e1560aec9f2660860b8fb831a5c9fc0f (diff) | |
| download | perl-b78df5de4cbb361d400476487114def2ea80ea60.tar.gz | |
Clarify the description differentiating for and while; inspired by
Subject: [ID 20010306.002] for/while difference in for definition
Message-Id: <20010306084036.7BFD0D17F@little-roots.geneanet.org>
p4raw-id: //depot/perl@9070
Diffstat (limited to 'pod/perlsyn.pod')
| -rw-r--r-- | pod/perlsyn.pod | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/pod/perlsyn.pod b/pod/perlsyn.pod index e6b420e5db..aad4efd2f7 100644 --- a/pod/perlsyn.pod +++ b/pod/perlsyn.pod @@ -263,7 +263,7 @@ available. Replace any occurrence of C<if BLOCK> by C<if (do BLOCK)>. =head2 For Loops -Perl's C-style C<for> loop works exactly like the corresponding C<while> loop; +Perl's C-style C<for> loop works like the corresponding C<while> loop; that means that this: for ($i = 1; $i < 10; $i++) { @@ -279,8 +279,10 @@ is the same as this: $i++; } -(There is one minor difference: The first form implies a lexical scope -for variables declared with C<my> in the initialization expression.) +There is one minor difference: if variables are declared with C<my> +in the initialization section of the C<for>, the lexical scope of +those variables is exactly the C<for> loop (the body of the loop +and the control sections). Besides the normal array index looping, C<for> can lend itself to many other interesting applications. Here's one that avoids the |