Rubyで 1234567を1,234,567と出力したい｡
require 'active_support'
require 'active_support/core_ext'
puts 1234567.to_s(:delimited) # 1,234,567
(requireは2つとも必要)
詳しくは
https://rip.hibariya.org/post/ruby-activesupport-to-s-args/
参照して下さい｡
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