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Spring @Transactional - isolation, propagation
...Default is REQUIRED. (docs.spring.io/spring-framework/docs/current/javadoc-api/org/…)
– ihebiheb
Dec 31 '17 at 13:18
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Why create “Implicitly Unwrapped Optionals”, since that implies you know there's a value?
...lasses in argument types and return types optional in imported Objective-C APIs. Before you use an Objective-C object, you should check to ensure that it is not missing.
In some cases, you might be absolutely certain that an Objective-C method or property never returns a nil object reference. T...
MPICH vs OpenMPI
... support many of the same networks. However, libfabric is a multi-faceted API, so not every network may be supported the same in both (e.g. MPICH has an OFI-based IBM Blue Gene/Q implementation, but I'm not aware of equivalent support in Open-MPI). However, the OFI-based implementations of both MP...
Running Bash commands in Python
... It is basically equivalent to subprocess.run(...).returncode
High-level API vs subprocess.Popen()
The refactored and extended subprocess.run() is more logical and more versatile than the older legacy functions it replaces. It returns a CompletedProcess object which has various methods which all...
Why is exception handling bad?
...ol, if possible.
There are pages of notes on the benefits of exceptions (API consistency, choice of location of error handling code, improved robustness, etc.) There's a section on performance that includes several patterns (Tester-Doer, Try-Parse).
Exceptions and exception handling are not bad. ...
What is the difference between YAML and JSON?
...prefer using JSON as the data format overwhelmingly along with popular web APIs so it becomes difficult to argue using YAML over JSON when doing web programming in the general sense as you will likely be outvoted in a team environment. In fact, the majority of web programmers aren't even aware YAML ...
What is DOM Event delegation?
...ntains() instead in the last example: developer.mozilla.org/en-US/docs/Web/API/Element/classList
– nc.
Sep 18 '16 at 6:33
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What is the difference between application server and web server?
...wo.
In most cases, the server creates this interaction through a component API, such as J2EE (Java 2 Platform), EJB (Enterprise JavaBean) and other different application software models.
An example:
The best way to understand the difference between the scenarios where an application server works wi...
RegEx for matching UK Postcodes
...ensure that a postcode legitimately exists.
For this, use an appropriate API! See Ben's answer for more info.
If you don't care about the bad regex and just want to skip to the answer, scroll down to the Answer section.
The Bad Regex
The regular expressions in this section should not be use...
Android accelerometer accuracy (Inertial navigation)
...just thinking out loud, and I haven't played with an android accelerometer API yet, so bear with me.
First of all, traditionally, to get navigation from accelerometers you would need a 6-axis accelerometer. You need accelerations in X, Y, and Z, but also rotations Xr, Yr, and Zr. Without the rotati...