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Why does C# disallow readonly local variables?
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I agree on the "save the programmer from himself" part, but as for helping the compiler to optimize code, I hold the stance that the compiler can find out very well whether or not a variable changes over the course of the method and optimizes accordingly either...
Performant Entity Serialization: BSON vs MessagePack (vs JSON)
...SON. That means some type information can be lost when you convert objects from BSON to JSON, but of course only when these special types are in the BSON source. It can be a disadvantage to use both JSON and BSON in single service.
MessagePack is designed to be transparently converted from/to JSON....
Unable to begin a distributed transaction
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Found it, MSDTC on the remote server was a clone of the local server.
From the Windows Application Events Log:
Event Type: Error
Event Source: MSDTC
Event Category: CM
Event ID: 4101
Date: 9/19/2011
Time: 1:32:59 PM
User: N/A
Computer: ASITESTSERVER
Description: ...
'this' vs $scope in AngularJS controllers
...rent scope objects, if prototypical inheritance is in play) are accessible from the HTML/view. E.g., from ng-click, filters, etc.
Long answer:
A controller function is a JavaScript constructor function. When the constructor function executes (e.g., when a view loads), this (i.e., the "function...
How to get maximum value from the Collection (for example ArrayList)?
... Naively iterating is faster (checked, comparator was fetching scores from a Map) than either sorting and getting first element or using max. Both sort+take first and max used a lambda.
– majTheHero
Mar 27 '19 at 12:24
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How to open a web page from my application?
... security hole in your application if you were to accidentally get the URL from user input and not validate that it is a URI. They can then launch any application they want on your system.
– cdiggins
Nov 6 '15 at 17:49
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Add one row to pandas DataFrame
... it to be in the dataframe.
>>> import pandas as pd
>>> from numpy.random import randint
>>> df = pd.DataFrame(columns=['lib', 'qty1', 'qty2'])
>>> for i in range(5):
>>> df.loc[i] = ['name' + str(i)] + list(randint(10, size=2))
>>> df
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Manually raising (throwing) an exception in Python
...ns, which preserve tracebacks:
raise RuntimeError('specific message') from error
Be aware:
this does allow changing the error type raised, and
this is not compatible with Python 2.
Deprecated Methods:
These can easily hide and even get into production code. You want to raise an exception...
Favorite Django Tips & Features?
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I'm just going to start with a tip from myself :)
Use os.path.dirname() in settings.py to avoid hardcoded dirnames.
Don't hardcode path's in your settings.py if you want to run your project in different locations. Use the following code in settings.py if you...
Where is Java's Array indexOf?
...tinlist The java guys thought of that too. Use Arrays.toList(list).sublist(from,to).indexOf(o) to search for an element within the range [from, to).
– Mario Carneiro
Jan 14 '16 at 22:23
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