reduce 问提请教

QUOTE:

reduce 问提请教

$foo = reduce { $a + $b } 0, @values;  

请教
这个 0 有什麽作用？
能不能举例 ...
rubyish 发表于 2011-05-14 07:33

QUOTE:

Reduces LIST by calling BLOCK, in a scalar context, multiple times, setting $a and $b each time. The first call will be with $a and $b set to the first two elements of the list, subsequent calls will be done by setting $a to the result of the previous call and $b to the next element in the list.