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With a block given, forms the substrings ("lines")
that are the result of splitting +self+
at each occurrence of the given line separator +line_sep+;
passes each line to the block;
returns +self+:
s = <<~EOT
This is the first line.
This is line two.
This is line four.
This is line five.
EOT
s.each_line {|line| p line }
Output:
"This is the first line.\n"
"This is line two.\n"
"\n"
"This is line four.\n"
"This is line five.\n"
With a different +line_sep+:
s.each_line(' is ') {|line| p line }
Output:
"This is "
"the first line.\nThis is "
"line two.\n\nThis is "
"line four.\nThis is "
"line five.\n"
With +chomp+ as +true+, removes the trailing +line_sep+ from each line:
s.each_line(chomp: true) {|line| p line }
Output:
"This is the first line."
"This is line two."
""
"This is line four."
"This is line five."
With an empty string as +line_sep+,
forms and passes "paragraphs" by splitting at each occurrence
of two or more newlines:
s.each_line('') {|line| p line }
Output:
"This is the first line.\nThis is line two.\n\n"
"This is line four.\nThis is line five.\n"
With no block given, returns an enumerator.
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