none

True if the block returns true for no element (including empty list).

Synopsis

my $bool = none { BLOCK } @list;
if ( none { $_ < 0 } @measurements ) { ... }

For each element none sets $_ to that element and calls the block in scalar context. It returns false as soon as the block returns true for any element. An empty list yields true.

What you get back

1 if every element failed the block, 0 otherwise.

Examples

die "negatives present" unless none { $_ < 0 } @measurements;
my $clean = none { /ERROR/ } @log_lines;
my $none  = none { 1 } ();               # 1 — nothing to fail

Differences from upstream

Fully compatible with upstream.

See also

• any — inverse: at least one match.

• all — require every element to match.

• notall — at least one failure.