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Why doesn't String switch statement support a null case?
... Paul BelloraPaul Bellora
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What is the difference between POST and GET? [duplicate]
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@Hristo: There are no issues with GET itself -- every site's home page is gotten by a GET, as are just about all links, so any security issues with it could break the whole web. The problem happens when web developers don't know a GET should be idempotent, and use it for things...
Convert string in base64 to image and save on filesystem in Python
...ng('RGB',(100,100),decodestring(imgData)) File "/opt/local/lib/python2.5/site-packages/PIL/Image.py", line 1744, in fromstring im.fromstring(data, decoder_name, args) File "/opt/local/lib/python2.5/site-packages/PIL/Image.py", line 575, in fromstring raise ValueError("not enough image da...
How to efficiently build a tree from a flat structure?
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Store IDs of the objects in a hash table mapping to the specific object. Enumerate through all...
Why is enum class preferred over plain enum?
...class Mammal { kangaroo, deer, human }; // another enum class
void fun() {
// examples of bad use of plain enums:
Color color = Color::red;
Card card = Card::green_card;
int num = color; // no problem
if (color == Card::red_card) // no problem (bad)
cout <...
How can I expand and collapse a using javascript?
I have created a list on my site. This list is created by a foreach loop that builds with information from my database. Each item is 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 subse...
How update the _id of one MongoDB Document?
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A fun issue with this appears if some field on that document has a unique index. In that situation, your example will fail because a document cannot be inserted with a duplicate value in a unique indexed field. You could fix ...
Prevent any form of page refresh using jQuery/Javascript
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@pankaj - That should be fixed on the application site, and cookies for example so the user shares the session across tabs.
– Nick Craver♦
Aug 19 '10 at 23:30
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How to track down log4net problems
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Just a note I found the fun way. Make sure the <configSections></configSections> is the first entry under <configuration>. Otherwise you end up with an error.
– Nick
Jul 25 '17 at 13:59
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How to convert a data frame column to numeric type?
... you want to convert to numeric. I suggest that you should apply transform function in order to complete your task.
Now I'm about to demonstrate certain "conversion anomaly":
# create dummy data.frame
d <- data.frame(char = letters[1:5],
fake_char = as.character(1:5),
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