[Pleac-discuss] Ruby section 8.4

[Alan C. <al...@di...>]

# @@PLEAC@@_8.4
#-----------------------------
# instead of file handle FILE, we can just
# use a string containing the filename
File.readlines(file).each { |line|
    # do something with line
}
#-----------------------------
File.readlines(file).reverse_each { |line|
    # do something with line
}
#-----------------------------
# the variable lines might have been created
# this way
# lines = File.readlines(file)
#
# normally one would use the reverse_each, but
# if you insist on using a numerical index to
# iterate over the lines array...
(lines.size - 1).downto(0) { |i|
    line = lines[i]
}
#-----------------------------
# the second readlines argument is a the 
# record separator $/, just like perl, a blank
# separator splits the records into paragraphs
File.readlines(file, '').each { |paragraph|
    # do something with paragraph
    puts "->Paragraph #{paragraph}"
}
#-----------------------------