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Prefer composition over inheritance?
...rs. Inheritance is more rigid as most languages do not allow you to derive from more than one type. So the goose is more or less cooked once you derive from TypeA.
My acid test for the above is:
Does TypeB want to expose the complete interface (all public methods no less) of TypeA such that Typ...
Difference between case object and object
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Case classes differ from regular classes in that they get:
pattern matching support
default implementations of equals and hashCode
default implementations of serialization
a prettier default implementation of toString, and
the small amount of...
When should I use RequestFactory vs GWT-RPC?
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I went through a transition from RPC to RF. First I have to say my experience is limited in that, I used as many EntityProxies as 0.
Advantages of GWT RPC:
It's very easy to set-up, understand and to LEARN!
Same class-based objects are used on the c...
Programmatically access currency exchange rates [closed]
...S dollars or Euros so they don't have to make the mental effort to convert from Australian dollars.
15 Answers
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How to break/exit from a each() function in JQuery? [duplicate]
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"simple return" actually returns. It will return control from the each and everything else around it and after it until it exit's each()'s parent control - such as a function() which is using each. This is the correct answer, and the other approach will not work.
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What does FETCH_HEAD in Git mean?
...TCH_HEAD is a short-lived ref, to keep track of what has just been fetched from the remote repository. git pull first invokes git fetch, in normal cases fetching a branch from the remote; FETCH_HEAD points to the tip of this branch (it stores the SHA1 of the commit, just as branches do). git pull th...
What's the difference between a proc and a lambda in Ruby?
...mbda {} gives you a proc that checks the number of arguments passed to it. From ri Kernel#lambda:
Equivalent to Proc.new, except the resulting Proc objects check the number of parameters passed when called.
An example:
p = Proc.new {|a, b| puts a**2+b**2 } # => #<Proc:0x3c7d28@(irb):1&g...
ViewDidAppear is not called when opening app from background
...roller in which my value is 0 (label) and when I open that View Controller from another ViewController I have set viewDidAppear to set value 20 on label. It works fine but when I close my app and than again I open my app but the value doesn't change because viewDidLoad , viewDidAppear and v...
Add text to Existing PDF using Python
... with canvas>
can.save()
packet.seek(0)
input = PdfFileReader(packet)
From here you can merge the pages of the input file with another document.
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Invoke(Delegate)
...nd are not
thread safe. Therefore, if you are calling a control's method from a
different thread, you must use one of the control's invoke methods to
marshal the call to the proper thread. This property can be used to
determine if you must call an invoke method, which can be useful if
you ...