Ruby Inserting Key, Value elements in Hash

Question

I want to add elements to my Hash lists, which can have more than one value. Here is my code. I don't know how I can solve it!

class dictionary

  def initialize(publisher)             
    @publisher=publisher
    @list=Hash.new()                    
  end

  def []=(key,value)
    @list << key unless @list.has_key?(key)
    @list[key] = value
  end

end


dic = Dictionary.new

dic["tall"] = ["long", "word-2", "word-3"]

p dic

Many thanks in advance.

regards,

koko

Solution 1

I think this is what you're trying to do

class Dictionary
  def initialize()
    @data = Hash.new { |hash, key| hash[key] = [] }
  end
  def [](key)
    @data[key]
  end
  def []=(key,words)
    @data[key] += [words].flatten
    @data[key].uniq!
  end
end

d = Dictionary.new
d['tall'] = %w(long word1 word2)
d['something'] = %w(anything foo bar)
d['more'] = 'yes'

puts d.inspect
#=> #<Dictionary:0x42d33c @data={"tall"=>["long", "word1", "word2"], "something"=>["anything", "foo", "bar"], "more"=>["yes"]}>

puts d['tall'].inspect
#=> ["long", "word1", "word2"]

Edit

Now avoids duplicate values thanks to Array#uniq!.

d = Dictionary.new
d['foo'] = %w(bar baz bof)
d['foo'] = %w(bar zim)     # bar will not be added twice!

puts d.inspect
#<Dictionary:0x42d48c @data={"foo"=>["bar", "baz", "bof", "zim"]}>

Solution 2

Probably, you want to merge two Hashes?

my_hash = { "key1"=> value1 }
another_hash = { "key2"=> value2 }
my_hash.merge(another_hash) # => { "key1"=> value1, "key2"=> value2 }

Comments

[glenn jackman]

The OP seemed to want to avoid duplicates, so you might want to use a Set instead of an Array for the hash values.

[maček]

@glenn, this avoids duplicate keys.

[user332550]

@macek and @glenn Do you means something like that? def []=(key,value) if [email protected]?(keys) @data[key] << value else @data[value] = Set.new() end return @data[key] = [value] end regards, koko

[maček]

@kokogyi, you need to paste a set of inputs and expected output or I can't help you any further. Edit your question and I'll try to help.

[glenn jackman]

@macek, not duplicate keys, but duplicate values -- d['foo'] = 'bar'; d['foo']=%w{bar baz}; d['foo'] # ==> ["bar", "bar", "baz"]

[Luke Mcneice]

Spend a while looking for something that suited what I needed and this is exactly it!