rspec - Store ruby code in a let() variable -

i want store code run inside each_with_index block:

describe '#each_with_index'   subject { [:a,:b].each_with_index{ block.to_ruby } }    context 'when block prints v console'     let(:block) { '|v| puts v' }     specify { expect { subject }.to output(':a :b').to_stdout }   end    context 'when block prints console'     let(:block) { '|v,i| puts i' }     specify { expect { subject }.to output('0 1').to_stdout }   end    context 'when block prints v , console'     let(:block) { '|v,i| puts "#{v} , {i}"' }     specify { expect { subject }.to output(':a , 0 :b , 1').to_stdout }   end end 

i don't need code stored string, way show mean. want in-block code, pipes, , everything. i've got feeling can use proc.new pipes tripping me up.

something like:

let(:block) { proc.new{ |v| puts v } } subject { [:a,:b].each_with_index { |*args| block.call args } }