arrays - ruby enumerables: is there a detect for results of block evaluation? -
i'm looking similar #detect in enumerables, not quite. enumerable does: [1, 2, 3].detect {|i| > 1 } #=> 2 it returns first instance of array matches condition. now, purpose return value of block. concern not conditions, instance, first not nil. this: [var1, var2, var3].wanted_detect {|var| another_function(var) } in function return first result of another_function call isn't nil. mapping values of applying method on variables , using detect not option. 1 ideally have work in lazy enumerators, mapping of possible values no-go [var1, var2, var3].lazy.map { |var| another_function(var) }.compact.first if don't have access enumerable#lazy , easy enough implement want: module enumerable def wanted_detect self.each |obj| val = yield obj return val if val end end end demo: [1, 2, 3, 4].wanted_detect { |x| x*x if x > 2 } # => 9 edit: sorry, missed last paragraph till falsetru pointed out. thanks comments, falset
