find the key associated with a value in a map in ruby

In Ruby, you can find the key associated with a value in a hash using the key method. Here's an example:

main.rb
my_hash = { a: 1, b: 2, c: 3 }
value = 2
key = my_hash.key(value)
puts key #=> :b
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In the example above, we have a hash called my_hash with three key-value pairs. We want to find the key of the value 2, which in this case is :b. We can use the key method of the hash and pass in the value we are looking for as an argument.