trait_foreach->inject

// Inject construct similar to Ruby's inject.

define trait_foreach->inject(p::any) => { 
   local(gb) = givenblock
   #gb->detach
  .foreach => { 
      #p = #gb(#p,#1) || #p
   }
   return #p
}

// Lasso
array(1,2,3,4)->inject(0) => { return #1 + #2 } // 10

// Ruby
// [1, 2, 3, 4].inject(0) { |result, element| result + element } // 10

array(1,2,3,4)->inject(array) => { #1->insert('element: '+ #2) }

// array(element: 1, element: 2, element: 3, element: 4)