ruby - Sum the value of array in hash

Question

This is my array

[{:amount=>10, :gl_acct_id=>1, :alt_amount=>20}, {:amount=>20, :gl_acct_id=>2
, :alt_amount=>30}]

i want result

[{:amount => 30}] or {:amount = 30}

Any idea?

Answer 1

Ruby versions >= 2.4.0 has an Enumerable#sum method. So you can do

arr.sum {|h| h[:amount] }