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How Do I Choose Between a Hash Table and a Trie (Prefix Tree)?
...ickly look up prefixes of keys, enumerate all entries with a given prefix, etc.
Advantages of linked structure:
If there are many common prefixes, the space they require is shared.
Immutable tries can share structure. Instead of updating a trie in place, you can build a new one that's different ...
GitHub: What is a “wip” branch?
... can happen also on any other competitive platform, e.g. Bitbucket, GitLab etc.
It can be the case also with your Git (the VCS, not GitHub, GitLab, etc. - it's not the same) on local machine. In situations when you would like to save your progress on current branch and move to another it can be he...
R object identification
...t(d=1:26, e=letters))
data(cars)
obj <- lm(dist ~ speed, data=cars)
..etc.
If obj is an S3 or S4 object, you can also try methods or showMethods, showClass, etc. Patrick Burns' R Inferno has a pretty good section on this (sec #7).
EDIT: Dirk and Hadley mention str(obj) in their answers. It ...
Is returning null bad design? [closed]
...o when I actually want to return null, I have been naming the method like getCustomerOrNull() to make it explicit. I think a method is named well when the reader doesn't want to look at the implementation.
– Mike Valenty
Aug 17 '09 at 4:23
...
How can I expand and collapse a using javascript?
...a container with different sections, so this is not a list like 1, 2, 3... etc. I am listing repeating sections with information. In each section, there is a subsection. The general build is as follows:
...
Add EBS to Ubuntu EC2 Instance
...ata that was on this volume previously.
Mount file system (with update to /etc/fstab so it stays mounted on reboot):
sudo mkdir -m 000 /vol
echo "/dev/xvdf /vol auto noatime 0 0" | sudo tee -a /etc/fstab
sudo mount /vol
s...
JRE 1.7 - java version - returns: java/lang/NoClassDefFoundError: java/lang/Object
...ibrary is contained in various JARs, such as rt.jar, deploy.jar, jsse.jar, etc. When the JRE is packaged, these critical JAR files are compressed with Pack200 and stored as rt.pack, deploy.pack, jsse.pack, etc. The Java installer is supposed to uncompress them. If you are experiencing this error, ap...
How to do a https request with bad certificate?
...e checks (which has legitimate uses - tunnels, nats, shared cluster certs, etc), while also having something that looks similar but actually completely ignores the certificate check. You need to know that the certificate is valid and signed by a cert that you trust. But in common scenarios, you kn...
How do I execute a stored procedure once for each row returned by query?
...ect field1, field2 from sometable where someotherfield is null
open cur
fetch next from cur into @field1, @field2
while @@FETCH_STATUS = 0 BEGIN
--execute your sproc on each row
exec uspYourSproc @field1, @field2
fetch next from cur into @field1, @field2
END
close cur
deallocate cu...
Allowing interaction with a UIView under another UIView
... touchesBegan:withEvent: and similar methods (like touchesMoved:withEvent: etc) to send some touches to a different object than where they first go. For example, in A, you could write something like this:
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
if ([self shouldForwar...