SO 74666328

test.rb

irb(main):032:0> value={:next_page_token=>nil, :group_definitions=>nil, :results_by_time=>[{:time_period=>{:start=>"2022-10-01", :end=>"2022-11-01"}, :total=>{"BlendedCost"=>{:amount=>"49.1803785401", :unit=>"USD"}}, :groups=>[], :estimated=>false}, {:time_period=>{:start=>"2022-11-01", :end=>"2022-12-01"}, :total=>{"BlendedCost"=>{:amount=>"79.0698396954", :unit=>"USD"}}, :groups=>[], :estimated=>false}, {:time_period=>{:start=>"2022-12-01", :end=>"2022-12-03"}, :total=>{"BlendedCost"=>{:amount=>"2.6918272089", :unit=>"USD"}}, :groups=>[], :estimated=>true}], :dimension_value_attributes=>[]}
=>
{:next_page_token=>nil,
...
irb(main):033:0* sum = value[:results_by_time]&.sum do |hash|
irb(main):034:0*   hash.dig(:total, 'BlendedCost', :amount)&.to_f || 0
irb(main):035:-> end
=> 130.9420454444