all

True if the block returns true for every element (including empty list).

Synopsis

my $bool = all { BLOCK } @list;
if ( all { defined } @values ) { ... }

For each element all sets $_ to that element and calls the block in scalar context. It returns false as soon as the block returns false for any element. An empty list yields true (the conventional “vacuous truth”).

What you get back

1 if every element satisfied the block, 0 otherwise.

Examples

die "found empty string" unless all { length } @strings;
my $ready = all { $_->is_ready } @workers;
my $yes   = all { $_ > 0 } ();           # 1 — vacuous truth

Differences from upstream

Fully compatible with upstream.

See also

• any — require at least one match.

• notall — inverse: at least one failure.

• none — inverse: zero matches.