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Naming Classes - How to avoid calling everything a “Manager”? [closed]
... some other libraries.
The top 20 are:
attribute
type
helper
collection
converter
handler
info
provider
exception
service
element
manager
node
option
factory
context
item
designer
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When do I use a dot, arrow, or double colon to refer to members of a class in C++?
...ing that C++ has three ways to refer to members of a class: a::b , a.b , and a->b . When do I use which one of these operators?
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How can I remove all text after a character in bash?
...rrectly, this would work:
echo "Hello: world" | cut -f1 -d":"
This will convert "hello: world" into "hello".
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Inner join vs Where
...="T2"."ID"))
-- 2 table access full table1
-- 3 table access full table2
And the execution plan for the query using a WHERE clause.
-- with where clause
EXPLAIN PLAN FOR
SELECT * FROM table1 t1, table2 t2
WHERE t1.id = t2.id;
SELECT *
FROM TABLE (DBMS_XPLAN.DISPLAY);
-- 0 select statement
-- 1...
Why doesn't list have safe “get” method like dictionary?
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The best thing you can do is to convert the list into a dict and then access it with the get method:
>>> my_list = ['a', 'b', 'c', 'd', 'e']
>>> my_dict = dict(enumerate(my_list))
>>> print my_dict
{0: 'a', 1: 'b', 2: 'c', 3: 'd'...
How costly is .NET reflection?
...rs using your application (if it's web) and it may add up just as if you'd convert million items. If particular method is 100-times slower it will be that much slower on small and big sets. Slower is slower.
– Robert Koritnik
Jul 26 '12 at 13:17
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Get file name and extension in Ruby
I'm working on a program to download a video from YouTube, convert it to MP3 and create a directory structure for the files.
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How to group dataframe rows into list in pandas groupby?
..., x, y]
C [6] [z]
To group-listify a single column only, convert the groupby to a SeriesGroupBy object, then call SeriesGroupBy.agg. Use,
df.groupby('a').agg({'b': list}) # 4.42 ms
df.groupby('a')['b'].agg(list) # 2.76 ms - faster
a
A [1, 2]
B [5, 5, 4]
C [...
Is it possible to change the textcolor on an Android SearchView?
...ny properties for changing the text color. The default text color is black and doesn't work on our dark background. Is there a way to change the color of the text without resorting to hacks?
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Is Java “pass-by-reference” or “pass-by-value”?
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Java is always pass-by-value.
Unfortunately, we never handle an object at all, instead juggling object-handles called references (which are passed by value of course). The chosen terminology and semantics easily confuse many beginners.
It goes like this:
public static void main(...