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Rather than have your data in arrays, you now have your data available in a fully object-oriented fashion. You could create methods within the Person class to help you manipulate your objects and so forth. This style of storing and manipulating data is true to the Ruby way of things and is entirely object-oriented. However, until now, your objects have only lasted until the end of a program, but with PStore it s easy to write them to a file:

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require 'pstore' store = PStore.new("storagefile") store.transaction do store[:people] ||= Array.new store[:people] << fred store[:people] << laura end

In this example you create a new PStore in a file called storagefile. You then start a transaction (data within a PStore file can only be read or updated while inside a transaction to prevent data corruption), and within the transaction you make sure the :people

Python s scopes may (from Python 2.2 on) be nested. This means that you can (among other things) write functions like the following: def multiplier(factor): def multiplyByFactor(number): return number*factor return multiplyByFactor One function is inside another, and the outer function returns the inner one. Each time the outer function is called, the inner one gets redefined, and each time, the variable factor may have a new value. With nested scopes, this variable from the outer local scope (of multiplier) is accessible in the inner function later on, as follows: >>> >>> 10 >>> >>> 9 >>> 20 double = multiplier(2) double(5) triple = multiplier(3) triple(3) multiplier(5)(4)

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element of the store contains something or gets assigned to be an array. Next, you push the fred and laura objects to the :people element of the store, and then end the transaction. The reason for the hash syntax is because a PStore is, effectively, a disk-based hash. You can then store whatever objects you like within that hash. In this example, you ve created an array within store[:people] and pushed your two Person objects to it. Later on, you can retrieve the data from the PStore database:

require 'pstore' store = PStore.new("storagefile") people = [] store.transaction do people = store[:people] end # At this point the Person objects inside people can be treated # as totally local objects. people.each do |person| puts person.name end

Custom-tailoring this presentation to this speci c audience continues in the Point A headline, which de nes the client s challenge as Your current messages are not reaching your target, and in the Point B headline, which de nes the client s goal as You d like to hit the target more accurately and frequently How does the client get from A to B The Call to Action headline provides direction in the form of the statement, Aim for three goals, and you ll hit the marks you want As your team moves to Act II to esh out the rest of the presentation, change the Act II headings from Key Point to Bene t, from Explanation to Feature, and from Detail to Demonstration if you prefer.

With only a simple storage and retrieval process, PStore makes it easy to add storage facilities to existing Ruby programs by allowing you to store existing objects into a PStore database. Object persistence is not ideal for many types of data storage, but if your program is heavily dependent on objects, and you want to store those objects to disk for later use, PStore provides a simple method to use.