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If strings are immutable in .NET, then why does Substring take O(n) time?
...(n) is O(1) if n does not grow large. Most people extract tiny substrings from tiny strings, so how the complexity grows asymptotically is completely irrelevant.
The long answer is:
An immutable data structure built such that operations on an instance permit re-use of the memory of the original w...
What is the difference between a Docker image and a container?
...
From my article on Automating Docker Deployments:
Docker Images vs. Containers
In Dockerland, there are images and there are containers. The two are closely related, but distinct. For me, grasping this dichotomy has clarifi...
Java - JPA - @Version annotation
...
Although @Pascal answer is perfectly valid, from my experience I find the code below helpful to accomplish optimistic locking:
@Entity
public class MyEntity implements Serializable {
// ...
@Version
@Column(name = "optlock", columnDefinition = "intege...
Any reason to prefer getClass() over instanceof when generating .equals()?
...in most of them. She also gets into the instanceof vs getClass. Some quote from it
Conclusions
Having dissected the four arbitrarily chosen examples of implementations of equals() , what do we conclude?
First of all: there are two substantially different ways of performing the check for type match ...
How can I get zoom functionality for images?
... This is great stuff, been looking for this for ages. Do use the code from github as it is more recent and just works better
– Alex
Jul 16 '12 at 18:20
2
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How to dismiss notification after action has been clicked
...e it an id - that is the unique id you can use to access it later (this is from the notification manager:
notify(int id, Notification notification)
To cancel, you would call:
cancel(int id)
with the same id. So, basically, you need to keep track of the id or possibly put the id into a Bundle ...
Scatterplot with marginal histograms in ggplot2
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You're right. They're sampled from the same distribution though, so the marginal histograms should theoretically match the scatter plot.
– oeo4b
Dec 17 '11 at 17:03
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Make sure only a single instance of a program is running
...tform and runs on Python 2.4-3.2. I tested it on Windows, OS X and Linux.
from tendo import singleton
me = singleton.SingleInstance() # will sys.exit(-1) if other instance is running
The latest code version is available singleton.py. Please file bugs here.
You can install tend using one of the f...
What is a regular expression for a MAC Address?
... As an aside, the quote above concerning "standard format" comes from Wikipedia, not the 802.3 standards body. IEEE 802-2014 actually specifies hyphens for ordinary MAC addresses (§ 8.1 ¶ 3) and colons for the obsolescent bit-reversed notation (¶ 4). Importantly, in practice, no one o...
How to work with Git branches and Rails migrations
...e). But in development, it should be no big deal to recreate the database from the schema, which is what rake db:schema:load will do.
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