How to merge multiple hashes?

Question

Right now, I'm merging two hashes like this:

department_hash  = self.parse_department html
super_saver_hash = self.parse_super_saver html

final_hash = department_hash.merge(super_saver_hash)

Output:

{:department=>{"Pet Supplies"=>{"Birds"=>16281, "Cats"=>245512, "Dogs"=>513926, "Fish & Aquatic Pets"=>46811, "Horses"=>14805, "Insects"=>364, "Reptiles & Amphibians"=>5816, "Small Animals"=>19769}}, :super_saver=>{"Free Super Saver Shipping"=>126649}}

But now I want to merge more in the future. For example:

department_hash  = self.parse_department html
super_saver_hash = self.parse_super_saver html
categories_hash  = self.parse_categories html

How to merge multiple hashes?

Answer 1

How about:

[department_hash, super_saver_hash, categories_hash].reduce &:merge

Answer 2

You can just call merge again:

h1 = {foo: :bar}
h2 = {baz: :qux}
h3 = {quux: :garply}

h1.merge(h2).merge(h3)
#=> {:foo=>:bar, :baz=>:qux, :quux=>:garply}