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Easy way to dismiss keyboard?
I have quite a few controls scattered throughout many table cells in my table, and I was wondering if there's an easier way to dismiss the keyboard without having to loop through all my controls and resigning them all as the first responder. I guess the question is.. How would I get the current firs...
Ruby on Rails: How do I add a not null constraint to an existing column using a migration?
In my Rails (3.2) app, I have a bunch of tables in my database but I forgot to add a few not null constraints. I've googled around but I can't find how to write a migration which adds not null to an existing column.
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Check if a given key already exists in a dictionary
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@Mohan Gulati: You understand that a dictionary is a hashtable of keys mapped to values, right? A hashing algorithm converts the key to an integer and the integer is used to find a location in the hash table that matches. en.wikipedia.org/wiki/Hash_table
– hug...
Lock-free multi-threading is for real threading experts
...id some great work in JSR-166.
Cliff Click has an interesting take on hash tables that does not rely on lock-striping - as the Java and .NET concurrent hash tables do - and seem to scale well to 750 CPUs.
If you are not afraid to venture into Linux territory, the following article provides more ins...
Python serialization - Why pickle?
... might be altered at runtime by the user.
You could have another group of tables in the database and write another function to go through everything stored and write it to the new database tables. Then you would need to write another function to be able to load something saved by reading all of tha...
Best practices for overriding isEqual: and hash
...ing to have all sorts of problems when trying to use them as keys in a hashtable (or any dictionary-type collections).
On the other hand, if 2 instances are not equal, they may or may not have the same hash - it is best if they don't. This is the difference between an O(1) search on a hash table...
How to set the width of a cell in a UITableView in grouped style
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A better and cleaner way to achieve this is subclassing UITableViewCell and overriding its -setFrame: method like this:
- (void)setFrame:(CGRect)frame {
frame.origin.x += inset;
frame.size.width -= 2 * inset;
[super setFrame:frame];
}
Why is it better? Because the oth...
Get selected text from a drop-down list (select box) using jQuery
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Hi how do you do this inside a Table row/cell, how do you know which of the Dropdown from the table, especially in ASP MVC 5
– transformer
Mar 12 '17 at 7:41
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What are the pros and cons of the leading Java HTML parsers? [closed]
...d HTMLCleaner just worked better.
I also use HTMLParser and Jericho for a table extraction task, which replaced some code written using Perl's libhtml-tableextract-perl. I use HTMLParser to filter the HTML for the table, then use Jericho to parse it. I agree with MJB's and Adam's comments that Jeri...
How to read data from a zip file without having to unzip the entire file
...can also extract to a file or other destinations).
Reading the zip file's table of contents is as easy as:
using (ZipFile zip = ZipFile.Read(ExistingZipFile))
{
foreach (ZipEntry e in zip)
{
if (header)
{
System.Console.WriteLine("Zipfile: {0}", zip.Name);
if ((zip.Comment ...