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bchase/map_module_method_to_proc.rb

Last active January 17, 2019 19:31
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map_module_method_to_proc.rb
module Email
def self.get_domain(email_address)
email_address&.split('@')&.last
end
end
emails = [ '[email protected]' ]
p emails.map(&Email.method(:get_domain))
# $ ruby ex.rb
# ["these8bits.com"]
Raw
map_module_method_to_proc1.rb
class Proc
# "f after g"
def <<(g)
f = self
Proc.new {|x| f.(g.(x))}
end
end
module Email
def self.get_domain(email_address)
email_address&.split('@')&.last
end
end
User = Struct.new :email
users = [ User.new('[email protected]') ]
p users.map(&(Email.method(:get_domain).to_proc << :email.to_proc))
# => ["these8bits.com"]
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