Question

Using method chaining I would like to amend the following code so that on each iteration the variables mult and n are printed. What method can help accomplish this?

(1..3).inject {|mult, n| mult * n}

Answer 1

Enumerable#tap is what you need

(1..3).inject { |mult, n| (mult * n).tap { |next_mult| p [n, mult, next_mult] } }