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Worst security hole you've seen? [closed]
...early days of online stores:
Getting a 90% discount by entering .1 in the quantity field of the shopping cart. The software properly calculated the total cost as .1 * cost, and the human packing the order simply glossed over the odd "." in front of the quantity to pack :)
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REST API error return good practices [closed]
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I wouldn't return a 200 unless there really was nothing wrong with the request. From RFC2616, 200 means "the request has succeeded."
If the client's storage quota has been exceeded (for whatever reason), I'd return a 403 (Forbidden):
The server understood the request, but is refusing to fulfi...
What is the difference between exit and return? [duplicate]
...= main(argc, argv); exit(ret);. The C standard guarantees that something equivalent to this happens if main returns, however the implementation handles it.
Example with return:
#include <stdio.h>
void f(){
printf("Executing f\n");
return;
}
int main(){
f();
printf("Back from...
belongs_to through associations
...n. You're better off caching the question_id on Choice and adding a unique index to the table (especially because validates_uniqueness_of is prone to race conditions).
If you're paranoid, add a custom validation to Choice that confirms that the answer's question_id matches, but it sounds like the e...
How to store arrays in MySQL?
... will not clutter the row containing the linked item. And the database can index those rows. Arrays typically aren't indexed.
If you don't need relational databases, you can use e.g. a key-value store.
Read about database normalization, please. The golden rule is "[Every] non-key [attribute] must ...
What is state-of-the-art for text rendering in OpenGL as of version 4.1? [closed]
...nates and only differ in the r coordinate, which is equal to the character index to render.
But like with the other techniques, the expected gains are marginal at the cost of being incompatible with previous generation hardware.
There is a handy tool by Jonathan Dummer for generating distance textu...
.NET data structures: ArrayList, List, HashTable, Dictionary, SortedList, SortedDictionary — Speed,
...re a fixed size collection that you can change the value stored at a given index.
SortedDictionary is an IDictionary that is sorted based on the keys.
SortedList is an IDictionary that is sorted based on a required IComparer.
So, the IDictionary implementations (those supporting KeyValuePairs) ar...
How to write loop in a Makefile?
...
qwert is just a target name that's unlikely to be a real file. Makefile rules need a target. As for the syntax error, you're missing some stuff - see update.
– paxdiablo
Sep 29 '09 at 7:...
jar not loaded. See Servlet Spec 2.3, section 9.7.2. Offending class: javax/servlet/Servlet.class
...ommand line useful in tracking down the offending jar file. it creates an index of all the class files in all the jars in the folder. Execute from within the lib folder of your deployed app, then search the index.txt file for the offending class.
for /r %X in (*.jar) do (echo %X & jar -tf %X)...
How to drop columns by name in a data frame
...
You should use either indexing or the subset function. For example :
R> df <- data.frame(x=1:5, y=2:6, z=3:7, u=4:8)
R> df
x y z u
1 1 2 3 4
2 2 3 4 5
3 3 4 5 6
4 4 5 6 7
5 5 6 7 8
Then you can use the which function and the - operat...