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September 8, 2017 16:54
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Group array of strings by first common characters
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def group_by_common_chars(strings_array) | |
max_length = strings_array.max_by(&:length).length | |
char_grouped_hash = (0..max_length).each_with_object({}) do |index, hash| | |
hash.merge!(strings_array.group_by { |string| string[0..index] }.select{|k, v| k.length == index + 1}) | |
end | |
index = 0 | |
result_hash = {} | |
char_grouped_hash.each do |key, values_array| | |
index += 1 | |
result_hash[key] = values_array.sort | |
next if 1 == index | |
values_array.each do |value| | |
keys = result_hash.select{ |k, v| v.include?(value) && k != key }.keys | |
if 1 == values_array.size && keys.present? | |
if result_hash[keys.first].size == 1 | |
result_hash.delete(keys.first) | |
else | |
result_hash.delete(key) | |
end | |
else | |
keys.each do |ke| | |
result_hash[ke].delete(value) | |
end | |
end | |
end | |
end | |
result_hash.reject!{|k, value| value.size.zero?} | |
end |
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