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Why is it faster to check if dictionary contains the key, rather than catch the exception in case it
...as to be unwound etc.
On the other hand, accessing a value in a dictionary by its key is cheap, because it's a fast, O(1) operation.
BTW: The correct way to do this is to use TryGetValue
obj item;
if(!dict.TryGetValue(name, out item))
return null;
return item;
This accesses the dictionary on...
How to redirect stderr to null in cmd.exe
...ing command redirection operators. Besides the "2>" construct mentioned by Tanuki Software, it lists some other useful combinations.
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In Ruby on Rails, how do I format a date with the “th” suffix, as in, “Sun Oct 5th”?
....day.ordinalize}")
=> "Fri Oct 3rd"
Note, if you are using IRB with Ruby 2.0, you must first run:
require 'active_support/core_ext/integer/inflections'
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How to get href value using jQuery?
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You can get current href value by this code:
$(this).attr("href");
To get href value by ID
$("#mylink").attr("href");
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How do Third-Party “tracking cookies” work?
...or the request being sent.
So, if website A contains an ad that is served by website B, then website B can set a cookie in your browser. For example, maybe website A uses <iframe src="http://websiteB.com/ad.html></iframe> to serve the ad from website B. Then when your browser goes to fe...
How to get only time from date-time C# [closed]
...ateTime).Add(myDateTime.TimeOfDay)
This way you can be consistent across all versions of .NET, even if Microsoft decides to change the base date to something else than 1/1/0001.
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Insert the carriage return character in vim
... If you're using the default Windows installation then replace CTRL+V by CTRL+Q since CTRL+V is remmaped to 'paste'.
– Cyber Oliveira
Oct 20 '09 at 15:12
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How to expand/collapse a diff sections in Vimdiff?
...-> temporarily disable simultaneous scrolling on both buffers, reenable by :set scrollbind and scrolling.
Most of what you asked for is folding: vim user manual's chapter on folding. Outside of diffs I sometime use:
zo -> open fold.
zc -> close fold.
But you'll probably be better serv...
What's the difference between JPA and Spring Data JPA?
...pecification (these implementations are usually referred to as Providers). By using Hibernate you tie yourself to that provider restricting your freedom to switch to another option when required (for example, you want to use EclipseLink or ObjectDB instead because Hibernate has a bug that halts your...
How can I loop through a C++ map of maps?
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@TannerSummers because accessing by value would add the inefficiency of copying each element; additionally if you wanted to modify the contents, you'd need to access the elements by references (or pointers) rather than by value.
– Riot
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