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When to use symbols instead of strings in Ruby?
...iers. For Ruby < 2.2 only use symbols when they aren't generated dynamically, to avoid memory leaks.
Full answer
The only reason not to use them for identifiers that are generated dynamically is because of memory concerns.
This question is very common because many programming languages don't h...
Iterating over all the keys of a map
Is there a way to get a list of all the keys in a Go language map? The number of elements is given by len() , but if I have a map like:
...
Can I replace groups in Java regex?
I have this code, and I want to know, if I can replace only groups (not all pattern) in Java regex.
Code:
7 Answers
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Which is faster in Python: x**.5 or math.sqrt(x)?
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I've now run it 3 times on codepad.org and all three times a() was much faster than b().
– Jeremy Ruten
Nov 29 '08 at 1:38
13
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How do CDI and EJB compare? interact?
...a EE 6 compliant server has it (Glassfish 3.0.1+ is not mistaken, JBoss 6+ etc.) You can take a look at JBoss Weld, a reference CDI implementation which you can use in for instance Tomcat...
– Maxym
Aug 13 '14 at 13:47
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Detecting design mode from a Control's constructor
... can also do it by checking process name:
if (System.Diagnostics.Process.GetCurrentProcess().ProcessName == "devenv")
return true;
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Convert Base64 string to an image file? [duplicate]
... data in the function before decoding the string, like so.
function base64_to_jpeg($base64_string, $output_file) {
// open the output file for writing
$ifp = fopen( $output_file, 'wb' );
// split the string on commas
// $data[ 0 ] == "data:image/png;base64"
// $data[ 1 ] == &l...
Python Flask, how to set content type
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Try like this:
from flask import Response
@app.route('/ajax_ddl')
def ajax_ddl():
xml = 'foo'
return Response(xml, mimetype='text/xml')
The actual Content-Type is based on the mimetype parameter and the charset (defaults to UTF-8).
Response (and request) objects are docume...
How to export data as CSV format from SQL Server using sqlcmd?
...th '""' + col1 + '""' AS col1, wrapped in (doubled) double quotes or just call a stored procedure.
– MisterIsaak
Dec 11 '13 at 17:17
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SELECT INTO a table variable in T-SQL
...as long as the CTE doesn't reference multiple tables using joins, unions , etc.
– nanestev
Apr 13 '18 at 14:11
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