functional ruby

functional ruby.txt

users_url = URI('https://jsonplaceholder.typicode.com/users')
calls = -> method_name, *args {
  -> object {
    object.public_send(method_name, *args)
  }
}
gets_value = -> key_name { calls[:[], key_name] }
email_ends_with = -> what {
  gets_value['email'] >> calls[:end_with?, what]
}
extracts = -> *keys {
  -> object { object.slice(*keys) }
}
Net::HTTP.get(users_url)
  .then(&JSON.method(:parse))
  .select(&email_ends_with['biz'])
  .map(&extracts['name', 'email'])
=> [{"name"=>"Leanne Graham", "email"=>"Sincere@april.biz"},
 {"name"=>"Kurtis Weissnat", "email"=>"Telly.Hoeger@billy.biz"},
 {"name"=>"Clementina DuBuque", "email"=>"Rey.Padberg@karina.biz"}]
 
 
 
 
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 https://medium.com/@baweaver/mf-abusing-rubys-operator-precedence-ccf3f071bad8