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Why start an ArrayList with an initial capacity?
The usual constructor of ArrayList is:
11 Answers
11
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Symfony 2: How do I check if a user is not logged in inside a template?
...dited Mar 1 '13 at 17:49
Pedro Cordeiro
1,8171818 silver badges3838 bronze badges
answered Mar 12 '12 at 2:00
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Is MATLAB OOP slow or am I doing something wrong?
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I've been working with OO MATLAB for a while, and ended up looking at similar performance issues.
The short answer is: yes, MATLAB's OOP is kind of slow. There is substantial method call overhead, higher than mainstream OO languages, a...
Dynamic variable names in Bash
..._variable[$1]}
}
If you can't use associative arrays (e.g., you must support bash 3), you can use declare to create dynamic variable names:
declare "magic_variable_$1=$(ls | tail -1)"
and use indirect parameter expansion to access the value.
var="magic_variable_$1"
echo "${!var}"
See BashFAQ...
Spring Java Config: how do you create a prototype-scoped @Bean with runtime arguments?
...onfig, I need to acquire/instantiate a prototype-scoped bean with constructor arguments that are only obtainable at runtime. Consider the following code example (simplified for brevity):
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Can TCP and UDP sockets use the same port?
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Yes, you can use the same port number for both TCP and UDP. Many protocols already do this, for example DNS works on udp/53 and tcp/53.
Technically the port pools for each protocol are completely independent, but for higher level protocols that can u...
How to import multiple .csv files at once?
...mber of variables but each from different times.
Is there a way in R to import them all simultaneously rather than having to import them all individually?
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Replace multiple characters in a C# string
...eans a search
The characters between [ and ] are the characters to search for (in any order)
The second / delimits the search-for text and the replace text
In English, this reads:
"Search for ; or , or \t or \r or (space) or exactly two sequential \n and replace it with \n"
In C#, you could do ...
`from … import` vs `import .` [duplicate]
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It depends on how you want to access the import when you refer to it.
from urllib import request
# access request directly.
mine = request()
import urllib.request
# used as urllib.request
mine = urllib.request()
You can also alias things yourself when you import fo...
Split string based on a regular expression
I have the output of a command in tabular form. I'm parsing this output from a result file and storing it in a string. Each element in one row is separated by one or more whitespace characters, thus I'm using regular expressions to match 1 or more spaces and split it. However, a space is being inser...