open("data.txt") {|f| f.each_line do |line| line.chomp! puts "#{f.lineno}: #{line}" end } # >> 1: hoge # >> 2: huga # >> 3: piyo f.lines.each_with_index も使えなくはないが、こちらは1行目を0と数えるので適宜使いわけるといい。 行数取得のために一時変数をループの度にインクリメントしていたような人は是非覚えておこう。 Register as a new user and use Qiita more conveniently You get articles that match your needsYou can efficiently read back useful informationYou can use dark themeWh
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