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Physical vs. logical / soft delete of database record?
...he isDeleted column, I suggest the usage of two different tables: one with orders and another with deleted orders. In that case, you will have to maintain both the table, but in reality, it is very easy to maintain. When you write UPDATE statement to the isDeleted column, write INSERT INTO another t...
Token Authentication vs. Cookies
...st example of a stateless protocol. But since most web apps need state, in order to hold the state between server and client, cookies are used such that the server can send a cookie in every response back to the client. This means the next request made from the client will include this cookie and wi...
Transactions in REST?
...ple items to a shopping basket and then submit that basket to process the order, you can add Bob's account entry to the transaction wrapper and then Bill's account entry to the wrapper. When all the pieces are in place then you can POST/PUT the transaction wrapper with all the component pieces. ...
Scala: Abstract types vs generics
...ed type abstraction
abstract class MaxCell extends AbsCell {
type T <: Ordered { type O = T }
def setMax(x: T) = if (get < x) set(x)
}
Here, the type declaration of T is constrained by an upper type bound which consists of a class name Ordered and a refinement { type O = T }.
The upper...
What are JavaScript's builtin strings?
...with that funny snippet. I have written that piece of code just for fun in order to send it to my wife on February 14 :) Having only Chrome installed on the laptop I had no options to check how it works in Firefox and IE. Moreover, I haven't really expected that toString() representation of build-in...
Cluster analysis in R: determine the optimal number of clusters
... maximum curvature. For discrete data, it is the point with maximum second order central difference (analog to max. second order derivative for continuous data). See stackoverflow.com/a/4473065/1075993 and stackoverflow.com/q/2018178/1075993. I guess that other graphical methods could be converted t...
How to read and write INI file with Python3?
...es
When writing out config files, ConfigObj preserves all comments and the order of members and sections
Many useful methods and options for working with configuration files (like the 'reload' method)
Full Unicode support
It has some draw backs:
You cannot set the delimiter, it has to be =… (p...
Does the Java &= operator apply & or &&?
...
In order to avoid redundancies (still allowing for short-circuiting), you can simply write a=a&&b().
– Unai Vivi
Sep 8 '12 at 9:39
...
Iterator Loop vs index loop [duplicate]
...urn
}
Advantages: more generic, works for all containers (even the new unordered associative containers, can also use different strides (e.g. std::advance(it, 2));
Disadvantages: need extra work to get the index of the current element (could be O(N) for list or forward_list). Again, the loop cont...
Jenkins / Hudson environment variables
...corner: The jenkins master caches the environment variables from slaves in order to patch the customizations. So if you change environment variables on a slave (system or user), you need to restart the master to update the slaves config.
– Thinkeye
Mar 25 '15 a...