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Encrypt & Decrypt using PyCrypto AES 256
...build two functions using PyCrypto that accept two parameters: the message and the key, and then encrypt/decrypt the message.
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When should we use Observer and Observable?
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You have a concrete example of a Student and a MessageBoard. The Student registers by adding itself to the list of Observers that want to be notified when a new Message is posted to the MessageBoard. When a Message is added to the MessageBoard, it iterates over it...
Difference between a User and a Login in SQL Server
...ly don't mess with. One of them that has me confused is the area of Logins and Users. Seems like it should be a pretty simple topic...
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Xcode 5 - “iOS Simulator failed to install application” every time I switch simulators
...t of an application from
iOS 7.0 to a release prior to iOS 7.0, building and running the
application may fail with the message “iOS Simulator failed to install
the application.”
Go to the iOS home screen, click and hold the application icon, then tap the hovering “X” button to ...
What is an .inc and why use it?
...at is the meaning of .inc? What it is used for? What are the disadvantages and advantages of using it?
8 Answers
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Why is it necessary to set the prototype constructor?
....create(Person.prototype);
Now what happens when we create a new Student and copy it?
var student1 = new Student("trinth");
console.log(student1.copy() instanceof Student); // => false
The copy is not an instance of Student. This is because (without explicit checks), we'd have no wa...
What is difference between Errors and Exceptions? [duplicate]
How can I differentiate between Errors and Exceptions in Java?
4 Answers
4
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Multiple Indexes vs Multi-Column Indexes
I've just been adding an Index to a table in SQL Server 2005 and it got me thinking. What is the difference between creating 1 index and defining multiple columns over having 1 index per column you want to index.
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How to return a string value from a Bash function
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There is no better way I know of. Bash knows only status codes (integers) and strings written to the stdout.
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What is the purpose of .PHONY in a Makefile?
...e used to build files from other files. Make assumes its target is a file, and this makes writing Makefiles relatively easy:
foo: bar
create_one_from_the_other foo bar
However, sometimes you want your Makefile to run commands that do not represent physical files in the file system. Good example...