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How to quickly check if folder is empty (.NET)?
...t contain any folders/files. I know, that there is a simple method. We get array of FileSystemInfo's and check if count of elements equals to zero. Something like that:
...
Fully custom validation error message with Rails
...z=>"can't be empty"}
#this returns the first element of the hash as an array like [:key,"value"]
@instance.errors.first # => [:song_rep_xyz, "can't be empty"]
#by doing the following, you are telling ruby to take just the second element of that array, which is the message.
@instance.errors.f...
pandas dataframe columns scaling with sklearn
...hod will produce the following warning:
DeprecationWarning: Passing 1d arrays as data is deprecated in 0.17
and will raise ValueError in 0.19. Reshape your data either using
X.reshape(-1, 1) if your data has a single feature or X.reshape(1, -1)
if it contains a single sample.
Converting ...
How to get number of entries in a Lua table?
...f 3, 5 and 9 are valid results for #t. The only sane way to use it is with arrays of one contiguous part without nil values.
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How to get the first non-null value in Java?
...
the efficiency reasons that i mentioned above is that an array allocation will happen each time you invoke the var arg version of the method. this could be wasteful for hand-fulls of items, which i suspect will be common usage.
– les2
May 4 '1...
How to get GET (query string) variables in Express.js on Node.js?
...on he was looking for a way to get all the query string parameters like an array. The correct answer is this: app.get('/', function(req, res){ console.log(req.query); });
– Richard Torcato
Jun 16 '16 at 11:07
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Using .NET, how can you find the mime type of a file based on the file signature not the extension
...nagedType.LPStr)] System.String pwzUrl,
[MarshalAs(UnmanagedType.LPArray)] byte[] pBuffer,
System.UInt32 cbSize,
[MarshalAs(UnmanagedType.LPStr)] System.String pwzMimeProposed,
System.UInt32 dwMimeFlags,
out System.UInt32 ppwzMimeOut,
System.UInt32 dwR...
Getting attribute using XPath
...re/book/title/@lang', xmlforest(book.title AS title, book.price AS price), ARRAY[ARRAY[]::TEXT[]]) FROM book LIMIT 1;
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Converting int to bytes in Python 3
...d\r\n' % 3
b'3\r\n'
See PEP 0461 -- Adding % formatting to bytes and bytearray.
On earlier versions, you could use str and .encode('ascii') the result:
>>> s = '%d\r\n' % 3
>>> s.encode('ascii')
b'3\r\n'
Note: It is different from what int.to_bytes produces:
>>> n =...
When should I use Arrow functions in ECMAScript 6?
...Script has changed quite a bit since ECMAScript 5.1 gave us the functional Array.forEach, Array.map and all of these functional programming features that have us use functions where for-loops would have been used before. Asynchronous JavaScript has taken off quite a bit. ES6 will also ship a Promise...