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Use curly braces to initialize a Set in Python
I'm learning python, and I have a novice question about initializing sets. Through testing, I've discovered that a set can be initialized like so:
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Does JavaScript guarantee object property order?
If I create an object like this:
12 Answers
12
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What is the ultimate postal code and zip regex?
...he world don't follow a common pattern. In some countries they are made up by numbers, in others they can be combinations of numbers an letters, some can contain spaces, others dots, the number of characters can vary from two to at least six...
What you could do (theoretically) is create a seperate...
Understanding implicit in Scala
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I'll explain the main use cases of implicits below, but for more detail see the relevant chapter of Programming in Scala.
Implicit parameters
The final parameter list on a method can be marked implicit, which means the values will be taken from the context in which th...
Take all my changes on the current branch and move them to a new branch in Git
I started work on what I thought would be a minor bug fix on my master branch. However, it has spiraled out of control to the point where I wish I had created a separate branch to do the development in the first place.
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Why are C# 3.0 object initializer constructor parentheses optional?
It seems that the C# 3.0 object initializer syntax allows one to exclude the open/close pair of parentheses in the constructor when there is a parameterless constructor existing. Example:
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What are all the escape characters?
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You can find the full list here.
\t Insert a tab in the text at this point.
\b Insert a backspace in the text at this point.
\n Insert a newline in the text at this point.
\r Insert a carriage return in the text at this point.
\f Insert a formfeed in the text ...
Regex for string contains?
...if a string contains a certain word (e.g. 'Test')? I've done some googling but can't get a straight example of such a regex. This is for a build script but has no bearing to any particular programming language.
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Convert string in base64 to image and save on filesystem in Python
I have a string in base64 format, which represents PNG image. Is there a way to save this image to the filesystem, as a PNG file?
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Using LIMIT within GROUP BY to get N results per group?
..._CONCAT aggregated function to get all years into a single column, grouped by id and ordered by rate:
SELECT id, GROUP_CONCAT(year ORDER BY rate DESC) grouped_year
FROM yourtable
GROUP BY id
Result:
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| ID | GROUPED_YEAR ...