find the union of two maps in ruby

To find the union of two maps (hashes) in Ruby, you can use the merge method. This method returns a new hash that contains the contents of both maps. Here's an example:

main.rb
map1 = { a: 1, b: 2 }
map2 = { b: 3, c: 4 }

union_map = map1.merge(map2)
puts union_map # { :a => 1, :b => 3, :c => 4 }
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In this example, map1 and map2 are two maps that we want to find the union of. We use the merge method with map2 as the argument to merge map2 into map1. The resulting union_map contains all the key-value pairs from both map1 and map2, with conflicting keys resolved using the values from map2.