How can you sort a hash by a single condition in Ruby?

Question

Ruby on Rails

For example, there is a list hash:

list[
{ "plan": 100, 'present': 40 }
{ "plan": 100, 'present': 85 }
{ "plan": 100, 'present': 60 }
]

How can one sort in such a way that when the value of present is closer to plan in numerical value, so that it is higher? In our case, the second must be first, the third must be second, and the first must be last.

Answer 1

list.sort { |a,b| a['plan']-a['present'] <=> b['plan']-b['present'] }