Sum all values from JSON response

Question

I have a JSON response that looks like this:

{  
   "km"   =>"32.381",
   "tarifa"   =>25.6
},
{  
   "km"   =>"23423",
   "tarifa"   =>235.6
},
...

I want to get the sum of all tarifas. I know that I need to use map for this but am still confused on how to do it.

Answer 1

Just use Array#sum:

array.sum { |e| e['tarifa'] }
#=> 261.2