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How to avoid 'cannot read property of undefined' errors?
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Best, we can use _.get() with default for easy read : _.get(object, 'a.b.c', 'default');
– Ifnot
Jun 18 '18 at 13:53
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reference assignment is atomic so why is Interlocked.Exchange(ref Object, Object) needed?
In my multithreaded asmx web service I had a class field _allData of my own type SystemData which consists of few List<T> and Dictionary<T> marked as volatile . The system data ( _allData ) is refreshed once in a while and I do it by creating another object called newData and fill...
Getting started with Haskell
...d around the functional programming paradigm in Haskell. I've done this by reading tutorials and watching screencasts, but nothing really seems to stick.
Now, in learning various imperative/OO languages (like C, Java, PHP), exercises have been a good way for me to go. But since I don't really know w...
Exception 'open failed: EACCES (Permission denied)' on Android
...evel 19, this permission is not enforced and all apps still have access to read from external storage.
– AndroidGeek
Jul 1 '15 at 8:15
1
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How to programmatically create and read WEP/EAP WiFi configurations in Android?
How to programmatically create and read WEP/EAP WiFi configurations in Android?
5 Answers
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SmtpException: Unable to read data from the transport connection: net_io_connectionclosed
...ncorrect and had a typo. But a wrong password can also give the "Unable to read data from the transport connection: net_io_connectionclosed." error. So check both the username and password. And for Azure users, the user name is of the form "azure_guid-withoutdashes@azure.com" (eg: azure_e9e062db4bfd...
How do I make a list of data frames?
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The other answers show you how to make a list of data.frames when you already have a bunch of data.frames, e.g., d1, d2, .... Having sequentially named data frames is a problem, and putting them in a list is a good fix, but best practice is to avoid having a bunch of data.frames not in a list in ...
What are the Ruby File.open modes and options?
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-----+--------------------------------------------------------
"r" | Read-only, starts at beginning of file (default mode).
-----+--------------------------------------------------------
"r+" | Read-write, starts at beginning of file.
-----+---------------------------------------------------...
android pick images from gallery
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Please don't forget to add runtime permissions for READ_EXTERNAL_STORAGE and WRITE_EXTERNAL_STORAGE for api level 23 and higher. Otherwise you may not get bitmap from gallery as not null. See stackoverflow.com/a/35285667/3341089
– oguzhan
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How to convert CSV file to multiline JSON?
...le.json', 'w')
fieldnames = ("FirstName","LastName","IDNumber","Message")
reader = csv.DictReader( csvfile, fieldnames)
for row in reader:
json.dump(row, jsonfile)
jsonfile.write('\n')
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