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What is a callback function?
...rvices to respond. Being aware of this, the service providers often design APIs using the callback pattern.
JavaScript supports callbacks very nicely e.g. with lambdas and closures. And there is a lot of activity in the JavaScript world, both on the browser as well as on the server. There are even ...
Prototypical inheritance - writing up [duplicate]
... users extending your code to use members that are not part of your public API. This can be both good and bad.
It's good because it enables you and others to mock certain members for testing easily. It gives others a chance to easily improve (patch) your code but this is also bad because there is ...
Add Keypair to existing EC2 instance
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sudo umount /vol-a
sudo rmdir /vol-a
Now, back on your system with ec2-api-tools, continue moving the EBS volume back to it’s home on the original instance A and start the instance again:
ec2-detach-volume $volume
ec2-attach-volume --instance $instance_a --device /dev/sda1 $volume
ec2-start-i...
How to resize superview to fit all subviews with autolayout?
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The correct API to use is UIView systemLayoutSizeFittingSize:, passing either UILayoutFittingCompressedSize or UILayoutFittingExpandedSize.
For a normal UIView using autolayout this should just work as long as your constraints are corre...
Android ListView with different layouts for each row
...'t have to call findViewById() every time in getView method. See List14 in API demos.
Create one generic layout that will conform all combinations of properties and hide some elements if current position doesn't have it.
I hope that will help you. If you could provide some XML stub with your data ...
How to filter specific apps for ACTION_SEND intent (and set a different text for each app)
...ice , I'd prefer to do it using intents and not using the Facebook/Twitter APIs.
12 Answers
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What is a NullPointerException, and how do I fix it?
...he evidence provided by the stack trace, the source code, and the relevant API documentation.
Let's illustrate with the simple example (above) first. We start by looking at the line that the stack trace has told us is where the NPE happened:
int length = foo.length(); // HERE
How can that throw ...
Why would one omit the close tag?
...s a misconception that experts were drawn to / target audience of unwieldy APIs).
SCMs and modern IDEs provide builtin solutions mostly alleviating close tag caretaking.
Discouraging any use of the ?> close tag merely delays explaining basic PHP processing behaviour and language semantics to es...
What's the difference between Ruby's dup and clone methods?
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Nothing has changed in Rails 5 either: api.rubyonrails.org/classes/ActiveRecord/…. So I believe there's something special in your case...
– jvalanen
Aug 3 '16 at 10:59
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What is the difference in maven between dependency and plugin tags in pom xml?
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@AndrewLogvinov - I have a multi pom project for api automation testing. One of the maven projects has automation tests. The build section of the project pom had only 1 plugin - maven surefire plugin with reference to a suite. The entire build tag was removed. Could you ple...