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Check for column name in a SqlDataReader object
... method that builds the same object for multiple stored procedures calls. One of the stored procedures has an additional column that is not used by the other stored procedures. I want to modified the method to accommodate for every scenario.
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Test whether string is a valid integer
...t in a shell script. If the user provided a valid integer, the script does one thing, and if not valid, it does something else. Trouble is, I haven't found an easy (and reasonably elegant) way of doing this - I don't want to have to pick it apart char by char.
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private final static attribute vs private final attribute
...t same data. Compare this with an instance variable: in that case, there's one independent version of the variable per instance of the class. So for example:
Test x = new Test();
Test y = new Test();
x.instanceVariable = 10;
y.instanceVariable = 20;
System.out.println(x.instanceVariable);
prints ...
TortoiseGit not showing icon overlays
...ping it inside a double quote makes it work again.
The original forum is gone, but a good summary is supplied in the comments.
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How do I compare two hashes?
...["c", 3]]
Hash[*difference.flatten]
=> {"c"=>3}
Doing it all in one operation and getting rid of the difference variable:
Hash[*(
(hash3.size > hash1.size) \
? hash3.to_a - hash1.to_a \
: hash1.to_a - hash3.to_a
).flatten]
=> {"c"=>3}
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Recursive search and replace in text files on Mac and Linux
...he {} + at the end means that find will append all results as arguments to one instance of the called command, instead of re-running it for each result. (One exception is when the maximal number of command-line arguments allowed by the OS is breached; in that case find will run more than one instanc...
How to read a large file - line by line?
I want to iterate over each line of an entire file. One way to do this is by reading the entire file, saving it to a list, then going over the line of interest. This method uses a lot of memory, so I am looking for an alternative.
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Deleting lines from one file which are in another file
...atching lines
-x to match whole lines only
-f f2 to get patterns from f2
One can instead use grep -F or fgrep to match fixed strings from f2 rather than patterns (in case you want remove the lines in a "what you see if what you get" manner rather than treating the lines in f2 as regex patterns).
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Why doesn't C++ have a garbage collector?
...rbage collection, and understanding them helps understanding why there is none in C++.
1. Performance ?
The first complaint is often about performance, but most people don't really realize what they are talking about. As illustrated by Martin Beckett the problem may not be performance per se, but ...
Can you split a stream into two streams?
...
Not exactly. You can't get two Streams out of one; this doesn't make sense -- how would you iterate over one without needing to generate the other at the same time? A stream can only be operated over once.
However, if you want to dump them into a list or something, you...