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How to drop columns using Rails migration
...:table_name, :column_name, :type, :options within the change method, since if you specify the type reverting the migration is possible. From the documentation: The typeand options parameters will be ignored if present. It can be helpful to provide these in a migration's change method so it can be re...
Merge and interleave two arrays in Ruby
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What if a has more than 3 elements?
– Michael Kohl
Sep 5 '11 at 21:17
116
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How can I check which version of Angular I'm using?
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First, when it is minified, it is not easy to search in a huge file for a license. Second, relying on license file/comment is not really a great choice since it may change by a minfier bug.
– Afshin Moazami
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Hash Map in Python
... depending on his input I am retrieving some information from the HashMap. If the user enters a key of the HashMap, I would like to retrieve the corresponding value.
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Is inject the same thing as reduce in ruby?
...hematics. Ruby aliases a lot in order to be intuitive to programmers with different backgrounds. If you want to use #length on an Array, you can. If you want to use #size, that's fine too!
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Split a List into smaller lists of N size
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So if I have a List length zillion, and I want to split into smaller lists Length 30, and from every smaller list I only want to Take(1), then I still create lists of 30 items of which I throw away 29 items. This can be done sma...
What's wrong with this 1988 C code?
...When the preprocessor expands them, your code will look roughly like:
if (c == ' ' || c == '\n' || c == '\t')
state = 0;; /* <--PROBLEM #1 */
else if (state == 0;) { /* <--PROBLEM #2 */
state = 1;;
That second semicolon causes the else to have no previous if as a mat...
Finding a substring within a list in Python [duplicate]
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print [s for s in list if sub in s]
If you want them separated by newlines:
print "\n".join(s for s in list if sub in s)
Full example, with case insensitivity:
mylist = ['abc123', 'def456', 'ghi789', 'ABC987', 'aBc654']
sub = 'abc'
print "\n...
Can I use __init__.py to define global variables?
...e:
>>> from mypackage import mymodule
my constant is 42
Still, if you do have constants, it would be reasonable (best practices, probably) to put them in a separate module (constants.py, config.py, ...) and then if you want them in the package namespace, import them.
mypackage/__init__....
JSON.NET Error Self referencing loop detected for type
...e fix only applies to JSON.net
The level of references can't be controlled if there is a deep reference chain
If you want to use this fix in a non-api ASP.NET project, you can add the above line to Global.asax.cs, but first add:
var config = GlobalConfiguration.Configuration;
If you want to use th...