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Where do you draw the line between functional requirements and aspects of design?
If i can illustrate, one function of my system is that it must implement a user hierarchy.
In this instance would the definition of what those hierarchies are come under requirements (assuming you already know what the user hierarchies are) or would they come under the design aspect of a project?
Where do you draw the line between functional requirements and aspects of design?
Requirements is what the code needs to do. Design gets into how it will do it, with class hierarchies, design patterns used, etc.
Requirements:
There must be A, B, and C types of
user. Type A is only able to edit
their own account, type B can edit
their own account and post to hidden
forums, type C can edit all accounts
and post to all forums. The application must have a small memory footprint because blah blah blah....
Design:
Each instance of the user class will
contain a member variable of a
permissions object. The permissions
object is a wrapper for a bit field
because memory is tight, but has
several convenience methods, called
foo, bar, and baz. foo does XXX and is
public, (eventually design gets very low level and is turned
into code).
I'm not saying that would be the actual design, but that's how the design should analyze the requirements and eventually become a working implementation.
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I'm trying to write a small dictionary Ruby app where I can look up existing entries, add and remove entries (ALL ENTRIES ARE PUT INTO A HASH). So right now I'm creating a Dictionary class and I'm not quite sure what exactly should be 'initialized' method.
I'm still pretty new to Ruby, so if someone could explain what should be initialized at the beginning of a class I'd be extremely grateful.
How do you know what to initialize?
Time and experience. In general, #new should:
Initialize instance variables.
Configure any object defaults.
Register itself with observers.
Housekeeping tasks needed to reach a minimal "ready" state.
Sometimes an object needs to do a lot more work to be "ready" (whatever that means for your class), and #new can just as easily do too little as too much. Finding the right balance for your application is what matters, so feel free to open new questions here or on Code Review Stack Exchange with more concrete questions and some actual code.
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I am new to ABAP programming. To prepare myself for my new job, I am reading ABAP books. During reading, I learned that ABAP has several legacy elements to keep it backwards compatible with older SAP releases.
Regarding GUIs, I am reading about SAP-UI (PARAMETERS, etc.) Dynpros and WebDynpros. Now, I am unsure about on what to focus my learning efforts on.
Are the common rules like "You should know a little about basic SAP-UI, but mainly focus on WebDypros."
Background information: My new employee does SAP customizing for small and medium sized enterprises.
I'm not a consultant, but I work for a medium (~120 employees) sized company myself. If you were to work for us you would mostly create custom abap reports, maybe sometimes program a user exit. Small companies usually don't spend the money needed for big SAP driven portals, so they probably don't use Netweaver AS Java at all. That means abap dynpro and abap lists as your main UI elements. Sometimes it is good to also know your way around other ways of creating reports, for instance SAP Query.
If I were you I would start with basic abap. You won't have any fun working with dynpros if you haven't gotten your head around the basic stuff first. Learn to work with internal tables, work areas, field symbols. Have a look at some basic ABAP Objects stuff (for instance the ALV grid, very useful for displaying all sorts of tables). You should also understand the ABAP Dictionary, the place where structures, tables, data elements, data domains ans search helps are defined.
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Excuse me for the title a little provocative.I'll take an example. Suppose you need to write a program to build a car. Here's a test program:
public void testCarBuilder()
{
expectedCar=someCar;
actualCar=carFactory.build(bigWhell, yellowBodyCar);
assertEqual(expectedCar, actualCar);
}
To know that to build a car, we need a function that will have the wheels and the carBody as parameter, it should at least have made an analysis of the program. This analysis can be done in natural language, UML or even directly write in the programming language!. We can write this analysis on a piece of paper, leaving it in our brain, or in writing to a file.
Analysis is already a skeleton of a program! So it was always at least one program skeleton write before the test!
Say that development task starts by writing tests is sybyllin, there is always a first skeleton program ( that we can call analysis) to write before. Unless someone shows me how the opposite may be possible.
Of ccourse some people write a test first.
In fact, you just wrote a test first in the question.
Your test has possibly then told you the code you need to write next, but you have discovered that after you wrote the test in the question.
I interpret your question as if you want to know how the design emerges when doing TDD.
In order to write a test you must define some boundary/surface/facade that the test should interact with. This design activity is done up front. The design that grows and changes is the one that is on the other side of that test boundary.
In your (trivial) example, the design that the tests help you discover is the one inside the carFactory. That's not very helpful, so I would say that your test is not that good.
There are different school within TDD. The one I practise advocate that you test from the outside and in. You choose a test boundary that is as close as possible to the system boundary. For instance, you let your test simulate button clicks in the user interface. When doing this, you are free to make changes to the design of the whole system on the other side of that button click.
In your example, why do you want to create a car? What did the user do to trigger this code, and how can the user tell that whatever she wanted to accomplish worked? That's what you should have in your test.
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All,
I'm interested in the ability to retrieve a specific element within a FHIR resource using a single URL call. For example, suppose I'm interested in the gender of my patients. I would read the using the URL, without having to walk the XML node path every time. Right now, this functionality does not appear to exist. What do you think about the usefulness of this? Would like to get a sense of the community interest. Thanks.
-Jeff
For the default query mechanism, you can't bring anything back other than the full resource. (And don't even have a guarantee that the desired element will be present on all instances of the resource unless that element was part of your search criteria - in which case, why bother asking? :>). There's a new mechanism for defining custom queries. Refer to _query in the search/query section of the FHIR spec. However, it's not clear whether this will allow retrieval of anything other than full resource instances either.
This functionality does not exist at this time. It's on the wishlist, and we're trying to decide whether we can frame it in a sensible and safe fashion. The case you describe is relatively obvious, but many others aren't. And, in fact, when I think about it, it's not really clear to me how it works. what do you get back? just the gender element? so the server needs to - in effect - do the node walk for you, and you get, instead, to deal with a profusion of different schemas. It's not really obvious to me that this is a net saving for the client, and it's certainly a greater cost for the server.
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I have an app which tests students' knowledge. After each unit, it transitions to an overall level view controller which I would like to keep score of how many units are complete. What would be the best way of doing this? I would like to present the results in a table view if possible.
Any help would be much appreciated.
Your question, as the commenters have said, is rather vague, so I will only offer general advice. In the class (or classes) where you test the students knowledge, you need to have some method that passes the name of that unit, and presumably a score, to the overall level view controller. There are a bunch of ways that this could be done. One way would be to post a notification with the NSNotificationCenter method postNotificationName:object:userInfo:. The userInfo could include the name of the unit, the score, and any other info you want. The overall level controller would register as an observer of that notification. The same notification could be sent from other classes, if you have a different class for each unit. The controller would then take the info in the notification and add it to an array which would be the data source for your table view.