class User
attr_accessor :id, :name
def initialize(id, name)
@id = id
@name = name
end
end
charlie = User.new(9, 'Charlie')
fred = User.new(1, 'Fred')
sally = User.new(3, 'Sally')
@users = [
fred,
fred,
fred,
sally,
charlie,
sally
]
user_counts = Hash.new(0)
@users.each {|user| user_counts[user] += 1}
p user_counts
puts
--output:--
{#<User:0x00000100867be8 @id=1, @name="Fred">=>3,
#<User:0x00000100867b70 @id=3, @name="Sally">=>2,
#<User:0x00000100867d00 @id=9, @name="Charlie">=>1}
ordered_results = user_counts.sort_by{|user| -user_counts[user]}
p ordered_results
puts
--output:--
[[#<User:0x00000100867be8 @id=1, @name="Fred">, 3],
[#<User:0x00000100867b70 @id=3, @name="Sally">, 2],
[#<User:0x00000100867d00 @id=9, @name="Charlie">, 1]]
cutoff = 2
most_appearances = ordered_results.take_while {|user, count| count >=
cutoff}
p most_appearances
puts
--output:--
[[#<User:0x00000100867be8 @id=1, @name="Fred">, 3],
[#<User:0x00000100867b70 @id=3, @name="Sally">, 2]]
top_users = most_appearances.map {|user, count| user}
p top_users
--output:--
[#<User:0x00000100867be8 @id=1, @name="Fred">, #<User:0x00000100867b70
@id=3, @name="Sally">]
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