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CHAPTER 4 DEVELOPING A BASIC RUBY APPLICATION
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Next you need to get the middle third of the length-sorted sentences in sentences_sorted, as these are the ones you ve deemed to be probably the most interesting. To do this you can divide the length of the array by 3, to get the number of elements in a third, and then grab that number of elements from one third into the array (note that you grab one extra element to compensate for rounding caused by integer division). This is done like so:
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one_third = sentences_sorted.length / 3 ideal_sentences = sentences_sorted.slice(one_third, one_third + 1)
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The first line takes the length of the array and divides it by 3 to get the quantity that is equal to a third of the array. The second line uses the slice method to cut out a section of the array to assign to ideal_sentences. In this case, assume that the sentences_sorted is 6 elements long. 6 divided by 3 is 2, so a third of the array is 2 elements long. The slice method then cuts from element 2 for 2 (plus 1) elements, so you effectively carve out elements 2, 3, and 4 (remember that array elements start counting from 0). This means you get the inner third of the ideal-lengthed sentences you wanted. The penultimate line checks to see if the sentence includes the word is or are, and only accepts each sentence if so:
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ideal_sentences = ideal_sentences.select { |sentence| sentence =~ /is|are/ }
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It uses the select method, as the stop word removal code in the previous section did. The expression in the code block uses a regular expression that matches against sentence, and only returns true if is or are are present within sentence. This means ideal_sentences now only contains sentences that are in the middle third length-wise and contain either is or are. The final line simply joins the ideal_sentences together with a full stop and space between them to make them readable:
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puts ideal_sentences.join(". ")
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Analyzing Files Other Than text.txt
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So far your application has the filename text.txt hard-coded into it. This is acceptable, but it d be a lot nicer if you could specify, when you run the program, what file you want the analyzer to process.
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Note This technique is only practical to demonstrate if you re running analyzer.rb from a command prompt or shell, as on Mac OS X or Linux (or Windows if you re using the Windows command prompt). If you re using an IDE on Windows, this section will be read-only for you.
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CHAPTER 4 DEVELOPING A BASIC RUBY APPLICATION
Typically, if you re starting a program from the command line, you can append parameters onto the end of the command and the program processes them. You can do the same with your Ruby application. Ruby automatically places any parameters that are appended to the command line when you launch your Ruby program into a special array called ARGV. To test it out, create a new script called argv.rb and use this code:
puts ARGV.join('-')
From the command prompt, run the script like so:
ruby argv.rb
The result will be blank, but then try to run it like so:
ruby argv.rb test 123
test-123
This time the parameters are taken from ARGV, joined together with a hyphen, and displayed on screen. You can use this to replace the reference to text.txt in analyzer.rb by replacing "text.txt" with ARGV[0] or ARGV.first (which both mean exactly the same thing the first element of the ARGV array). The line that reads the file becomes the following:
lines = File.readlines(ARGV[0])
To process text.txt now, you d run it like so:
ruby analyzer.rb text.txt
You ll learn more about deploying programs and making them friendly to other users, along with ARGV, in 10.
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