product

Multiply every value in the list and return the numerical product.

תקציר

my $p = product @values;
my $p = product 1..10;           # 3628800

מה מוחזר

A single number. Integer overflow is promoted to floating point transparently, so the result is an integer as long as the exact product fits in an IV. An empty list yields 1 (the multiplicative identity).

דוגמאות

my $n = product 3, 9, 12;        # 324
my $n = product();               # 1
my $n = product map { $_->weight } @items;

הבדלים מן ה-upstream

Fully compatible with upstream.

ראו גם

• sum - additive counterpart.

• sum0 - additive counterpart that mirrors product’s identity-element behaviour on empty input.

• reduce - the generic reduction when product is not specific enough.