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How to determine if a number is a prime with regex?
... == 3.
.?
The first part of the regex says, "any character, zero or one times". So basically, is there zero or one character-- or, per what I mentioned above, n == 0 || n == 1. If we have the match, then return the negation of that. This corresponds with the fact that zero and one are NOT prime.
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Last iteration of enhanced for loop in java
Is there a way to determine if the loop is iterating for the last time. My code looks something like this:
21 Answers
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C++ Returning reference to local variable
...rk because you're returning an alias (a reference) to an object with a lifetime limited to the scope of the function call. That means once func1() returns, int i dies, making the reference returned from the function worthless because it now refers to an object that doesn't exist.
int main()
{
i...
Pass correct “this” context to setTimeout callback?
How do I pass context into setTimeout ? I want to call this.tip.destroy() if this.options.destroyOnHide after 1000 ms. How can I do that?
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How to calculate time in hours between two dates in iOS
How can I calculate the time elapsed in hours between two times (possibly occurring on different days) in iOS?
5 Answers
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Mercurial (hg) commit only certain files
... hg commit foo.c foo.h dir/
That just works and that's what I do all the time. You can also use the --include flag that you've found, and you can use it several times like this:
$ hg commit -I foo.c -I "**/*.h"
You can even use a fileset to select the files you want to commit:
$ hg commit "set...
Stop all active ajax requests in jQuery
...
Every time you create an ajax request you could use a variable to store it:
var request = $.ajax({
type: 'POST',
url: 'someurl',
success: function(result){}
});
Then you can abort the request:
request.abort();
You...
Difference between string and char[] types in C++
... a DLL function to make sure he's using the exact same compiler and C++ runtime implementation, lest he risk his string class behaving differently.
Normally, a string class would also release its heap memory on the calling heap, so it will only be able to free memory again if you're using a shared ...
Changing the cursor in WPF sometimes works, sometimes doesn't
...ice, but is not safe if multiple views are updating the cursor at the same time. Easy to get into a race condition where ViewA set's cursor, then ViewB sets a different one, then ViewA tries to reset its cursor (which then pops ViewB's off the stack and leaves ViewA's cursor active). Not until ViewB...
What is the difference between memoization and dynamic programming?
...cesses in the dynamic-programming algorithm can be exploited to reduce the time or space requirements even further
If some subproblems in the subproblem space need not be solved at all, the memoized solution has the advantage of solving only those subproblems that are definitely required
A...