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What are the differences between Abstract Factory and Factory design patterns?
I know there are many posts out there about the differences between these two patterns, but there are a few things that I cannot find.
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How do I remove a MySQL database?
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If your database cannot be dropped, even though you have no typos in the statement and do not miss the ; at the end, enclose the database name in between backticks:
mysql> drop database `my-database`;
Backticks are for ...
How to delete selected text in the vi editor
I am using PuTTY and the vi editor. If I select five lines using my mouse and I want to delete those lines, how can I do that?
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How to handle Objective-C protocols that contain properties?
...l, they have no variables or methods themselves - they only describe a specific set of attributes that is true about your class so that objects holding references to them can use them in specific ways.
That means in your class that conforms to your protocol, you have to do everything to make sure a...
Remove duplicate dict in list in Python
...aries in the list
t is one of the tuples created from a dictionary
Edit: If you want to preserve ordering, the one-liner above won't work since set won't do that. However, with a few lines of code, you can also do that:
l = [{'a': 123, 'b': 1234},
{'a': 3222, 'b': 1234},
{'a': 123...
hexadecimal string to byte array in python
I have a long Hex string that represents a series of values of different types. I wish to convert this Hex String into a byte array so that I can shift each value out and convert it into its proper data type.
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Chai: how to test for undefined with 'should' syntax
... should syntax. It works by adding the should property to all objects, but if a return value or variable value is undefined, there isn't a object to hold the property.
The documentation gives some workarounds, for example:
var should = require('chai').should();
db.get(1234, function (err, doc) {
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How to safely call an async method in C# without await
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If you want to get the exception "asynchronously", you could do:
MyAsyncMethod().
ContinueWith(t => Console.WriteLine(t.Exception),
TaskContinuationOptions.OnlyOnFaulted);
This will allow you to deal with an...
Change default primary key in Eloquent
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What if I have more than one fields as primary key?
– Bagusflyer
May 17 '14 at 4:49
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Is there an easy way to strike through text in an app widget?
I was wondering if there is an easy way to strike text within an app widget in Android. In a normal activity, it is pretty easy, using textview flags:
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