Pathname#each_line (Ruby 4.0 リファレンスマニュアル)

each_line(*args) {|line| ... } -> nil[permalink][rdoc][edit]

each_line(*args) -> Enumerator

(?String sep, ?Integer limit, ?mode: Integer | String, ?flags: Integer, ?external_encoding: encoding, ?internal_encoding: encoding, ?encoding: encoding, ?textmode: boolish, ?binmode: boolish, ?autoclose: boolish, ?chomp: boolish) { (String) → untyped } → nil
(Integer limit, ?mode: Integer | String, ?flags: Integer, ?external_encoding: encoding, ?internal_encoding: encoding, ?encoding: encoding, ?textmode: boolish, ?binmode: boolish, ?autoclose: boolish, ?chomp: boolish) { (String) → untyped } → nil
(?String sep, ?Integer limit, ?mode: Integer | String, ?flags: Integer, ?external_encoding: encoding, ?internal_encoding: encoding, ?encoding: encoding, ?textmode: boolish, ?binmode: boolish, ?autoclose: boolish, ?chomp: boolish) → Enumerator[String, nil]
(Integer limit, ?mode: Integer | String, ?flags: Integer, ?external_encoding: encoding, ?internal_encoding: encoding, ?encoding: encoding, ?textmode: boolish, ?binmode: boolish, ?autoclose: boolish, ?chomp: boolish) → Enumerator[String, nil]

IO.foreach(self.to_s, *args, &block) と同じです。

例

require "pathname"

IO.write("testfile", "line1\nline2,\nline3\n")
p Pathname("testfile").each_line
# => #<Enumerator: IO:foreach("testfile")>

例ブロックを指定

require "pathname"

IO.write("testfile", "line1\nline2,\nline3\n")
Pathname("testfile").each_line {|f| p f }

# => "line1\n"
# => "line2,\n"
# => "line3\n"

例 limit を指定

require "pathname"

IO.write("testfile", "line1\nline2,\nline3\n")
Pathname("testfile").each_line(4) {|f| p f }

# => "line"
# => "1\n"
# => "line"
# => "2,\n"
# => "line"
# => "3\n"

例 sep を指定

require "pathname"

IO.write("testfile", "line1\nline2,\nline3\n")
Pathname("testfile").each_line(",") {|f| p f }

# => "line1\nline2,"
# => "\nline3\n"

[SEE_ALSO] IO.foreach