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Add two hashes with same key in ruby


Add two hashes with same key in ruby

By : feamcor
Date : November 16 2020, 06:23 AM
it fixes the issue Its syntactically incorrect even for JSON, I believe. You want an array of hashes, by turning the outer {} into []. Better: c = [a,b].to_json
code :


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Diff of hashes with a correction factor in Ruby for dynamic hashes

Diff of hashes with a correction factor in Ruby for dynamic hashes


By : user2769444
Date : March 29 2020, 07:55 AM
this one helps. Similar to this question How do I create a diff of hashes with a correction factor? I want to compare the hashes inside an array but the hashes can be dynamic.
code :
def get_diff(input,correct_factor)
    input_hash_merged = Hash.new
    solution_hash = Hash.new
    input.select{ |x| input_hash_merged.merge!(x) }
    input_hash_merged.each do |k,v|
        arr = Array.new
        freq = Hash.new(0)
        input.select{ |x| arr << x[k] unless x[k].nil? }
        arr.select{ |x| freq[x] += 1 }
        max_element = arr.sort_by { |x| freq[x] }.last
        max_count = freq.values.sort.last
        solution_hash[k] = max_element unless max_count < correct_factor
    end
    unmatched_hash = input_hash_merged.reject{|k,v| !solution_hash[k].nil?} 
    p solution_hash
    p unmatched_hash
end
Create Nested Hashes from a List of Hashes in Ruby

Create Nested Hashes from a List of Hashes in Ruby


By : user117096
Date : March 29 2020, 07:55 AM
Hope that helps The problem of your code is: memo did not hold the value. Use a variable outside the loop to hold the value would be ok:
code :
memo = Hash.new {|h,k| h[k] = Hash.new {|hh, kk| hh[kk] = 0 } }

r.each do |x|
  memo[x.keys.first][x.values.first] += 1
end

p memo
# NOT RIGHT
memo = Hash.new(Hash.new(0)) 
memo = Hash.new({})
Ruby : Generate a Hash of Hashes from an Array of Hashes

Ruby : Generate a Hash of Hashes from an Array of Hashes


By : Chucky Millions
Date : March 29 2020, 07:55 AM
should help you out I have the following
code :
Hash[friends.map { |f| _f = f.dup; [_f.delete(:name), _f] }]
# => {"Jack"=>{:attr1=>"def", :attr2=>"def"}, "Jill"=>{:attr1=>"def", :attr2=>"def"}}
In Ruby how to retrieve only the keys from a hash that has both hashes and arrays and array of hashes

In Ruby how to retrieve only the keys from a hash that has both hashes and arrays and array of hashes


By : Tammy Guffey
Date : March 29 2020, 07:55 AM
Hope this helps
code :
require 'json'

# Decode a JSON string into a Ruby object
h = JSON.parse <<END
  # Your JSON structure here
END

# Will return all hash keys of o
def keys(o)
  # If it is an array, returns the keys of each element
  return o.map {|e| keys(e) }.flatten(1) if Array === o
  # If it is an hash, returns the keys and the keys of each value
  return o.map {|k, v| [k, *keys(v)] }.flatten(1) if Hash === o
  # Otherwise, it has no keys. Return an empty array
  []
end

keys(h) # Calls the method just defined
# => ["CourseID", "Course", "Code", "Name", "Qualification", "Discipline",
#     "Modules", "ID", "Code", "Name", "Core", "Units", "ID", "Code", "Name",
#     "Core", "my_key", "ID", "Code", "Name", "Core", "my_key"]
Why are Ruby hashes called hashes, and not maps, dicts, tables or associatve arrays?

Why are Ruby hashes called hashes, and not maps, dicts, tables or associatve arrays?


By : Maxime Bony
Date : March 29 2020, 07:55 AM
I wish this help you Ruby takes a large amount of inspiration from Perl, and Perl calls this a hash.
UPDATE:
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