What I want to do
I’d like to convert the Hash from
{1=>:a, 2=>:b, 3=>:c}
to:
{3=>:c, 2=>:b, 1=>:a}
How to reverse the order of Hash
reverse_each.to_h is the way to reverse the order of Hash entries.
{ 1 => :a, 2 => :b, 3 => :c }.reverse_each.to_h #=> {3=>:c, 2=>:b, 1=>:a}
Or you could use to_a.reverse.to_h as well.
{ 1 => :a, 2 => :b, 3 => :c }.to_a.reverse.to_h #=> {3=>:c, 2=>:b, 1=>:a}
Just sort by the key
FYI, if you just want to sort the Hash by the key, sort.to_h can be used.
{b: 2, a: 1, x: -1, c: 3}.sort.to_h #=> {:a=>1, :b=>2, :c=>3, :x=>-1}