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How to grep (search) committed code in the Git history
... at all. My command is > git log -p --all -S 'public string DOB { get; set; } = string.Empty;' and every time I try to run it I get > fatal: ambiguous argument 'string': unknown revision or path not in the working tree. > Use '--' to separate paths from revisions, like this: > 'git &l...
How to convert a number to string and vice versa in C++
...an use stream manipulators, such as std::endl, std::hex and functions std::setw(), std::setprecision() etc. with string streams in exactly the same manner as with cout
Do not confuse std::ostringstream with std::ostrstream. The latter is deprecated
Use boost lexical cast. If you are not familiar wi...
Getting value of public static final field/property of a class in Java via reflection
...ardless of their being final. If the field is not public, you need to call setAccessible(true) on it first, and of course the SecurityManager has to allow all of this.
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Print a file's last modified date in Bash
I can't seem to find how to print out the date of a file. I'm so far able to print out all the files in a directory, but I need to print out the dates with it.
...
Change UICollectionViewCell size on different device orientations
...eOrientationIsPortrait(orientationOnLunch)) {
[self.menuCollectionView setCollectionViewLayout:self.portraitLayout];
} else {
[self.menuCollectionView setCollectionViewLayout:self.landscapeLayout];
}
Then I simply modified my collectionViewFlowLayoutDelgate Methods like this
- (CGSize)col...
how to show lines in common (reverse diff)?
.... I find grep to be more admin-friendly than comm, so if you just want the set of matching lines (useful for comparing CSVs, for instance) simply use
grep -F -x -f file1 file2
or the simplified fgrep version
fgrep -xf file1 file2
Plus, you can use file2* to glob and look for lines in common wi...
Evaluating a mathematical expression in a string
..."- +")) +
(ident + lpar + expr + rpar | pi | e | fnumber).setParseAction(self.pushFirst))
| Optional(oneOf("- +")) + Group(lpar + expr + rpar)
).setParseAction(self.pushUMinus)
# by defining exponentiation as "atom [ ^ factor ]..." instead of
...
What is dynamic programming? [closed]
... a lot in string problems, such as the string edit problem. You solve a subset(s) of the problem and then use that information to solve the more difficult original problem.
With dynamic programming, you store your results in some sort of table generally. When you need the answer to a problem, you r...
Why is super.super.method(); not allowed in Java?
...just an easy-to-understand example of violating encapsulation. It could be setting a property instead. Besides, not all aspects will be visible at a type level. Generics isn't the answer to everything.
– Jon Skeet
Feb 25 '09 at 15:56
...
List of Big-O for PHP functions
...sts at N=1 and N=1,000,000 is ~50% time increase.
Interesting Points:
isset/array_key_exists is much faster than in_array and array_search
+(union) is a bit faster than array_merge (and looks nicer). But it does work differently so keep that in mind.
shuffle is on the same Big-O tier as array_ran...