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How to recognize swipe in all 4 directions
I need to use swipe to recognize swipe gesture down and then right. But on swift UISwipeGestureRecognizer has predeterminate Right direction.. And I don't know how make this for use other directions..
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What is the difference between join and merge in Pandas?
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I always use join on indices:
import pandas as pd
left = pd.DataFrame({'key': ['foo', 'bar'], 'val': [1, 2]}).set_index('key')
right = pd.DataFrame({'key': ['foo', 'bar'], 'val': [4, 5]}).set_index('key')
left.join(right, lsuffix='_l', rsuffix='_r')
val_l ...
Can I exclude some concrete urls from inside ?
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The standard Servlet API doesn't support this facility. You may want either to use a rewrite-URL filter for this like Tuckey's one (which is much similar Apache HTTPD's mod_rewrite), or to add a check in the doFilter() method of th...
How can I configure NetBeans to insert tabs instead of a bunch of spaces?
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Go to Tools-> Options-> Editor-> Formatting and uncheck Expand tabs to spaces:
Ensure you also pick coherent values for "Number of Spaces per indent" and "Tab Size".
Additionally, you can check all the items in the Language combo and make sure they all use the ge...
Why do we have to specify FromBody and FromUri?
Why are the FromBody and FromUri attributes needed in ASP.NET Web API`?
4 Answers
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How to create a unique index on a NULL column?
...f uniques" -- NULL is a special value in SQL (similar in many ways to NaN) and needs to be treated accordingly. It's actually a failure in in SQL Server to honor various SQL specifications: here is a link for a request for the "correct implementation" for what it is worth: connect.microsoft.com/SQLS...
PostgreSQL function for last inserted ID
...an id column created with the SERIAL pseudo-type. To avoid relying on this and to feel more clean, you can use instead pg_get_serial_sequence:
INSERT INTO persons (lastname,firstname) VALUES ('Smith', 'John');
SELECT currval(pg_get_serial_sequence('persons','id'));
Caveat: currval() only work...
What is the best way to filter a Java Collection?
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Java 8 (2014) solves this problem using streams and lambdas in one line of code:
List<Person> beerDrinkers = persons.stream()
.filter(p -> p.getAge() > 16).collect(Collectors.toList());
Here's a tutorial.
Use Collection#removeIf to modify the collection...
SSO with CAS or OAuth?
...is not a 'successor' or 'substitute' for CAS, they're different, in intent and in implementation.
CAS centralizes authentication. Use it if you want all your (probably internal) applications to ask users to login to a single server (all applications are configured to point to a single CAS server).
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How to remove non-alphanumeric characters?
...be "~" or "@" or whatever character you want to use as long as the opening and closing delimiters are the same) and change the behavior of the expression.
– Doktor J
Apr 13 '14 at 22:04
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