Ruby/Range/inject
Материал из Wiki.crossplatform.ru
How many negative numbers?
(-2..10).inject(0) {|num, x| x<0 ? num+1 : num } # => 2
Inject a range
sum = (1..5).inject {|total,x| total + x} # => 15 prod = (1..5).inject {|total,x| total * x} # => 120 max = [1,3,2].inject {|m,x| m>x ? m : x} # => 3 [1].inject {|total,x| total + x} # => 1: block never called
