Mahmoud Rusty Abdelkader mahmoudimus

It took a few years, but I finally understand why member functions of classes in JavaScript aren't automatically bound to their objects, in particular when used in callback arguments.

In most object-oriented languages, functions are members of a class--they exist in memory only once, and when they are called, this is simply a hidden argument of the function which is assigned to the object that's calling it. Python makes this explicit by requiring that the first argument of a class's member function be self (Python's equivalent of this--you can name self whatever you want, but self is the convention).

class MyClass:

Stop using noargsconstructors and setters (and builders)

TLDR summary

Noargsconstructors and setters are outdated, 90's style old school Java. They needlessly allow entire categories of defects that are easily avoided by using only allargsconstructors and no setters. Please stop writing code like that.

Longer version

How many times have you come across (or written) code like this

public class User {

This is about how to split a GitHub pull request, following a real in-the-wild example.

So it happened that I once wanted to fix a bug (#832) on the shelljs repository.

I forked the repository, cloned it and created a new branch called ln-directory-dest. I fixed the bug, created a pull request, and implemented initial review feedback.

At this point, I had added the commits A, B, C, D, E and [F](https://github.com/Loilo/shelljs/commit/946ab48bf5cf9c8aac03407

Quick Tips for Fast Code on the JVM

I was talking to a coworker recently about general techniques that almost always form the core of any effort to write very fast, down-to-the-metal hot path code on the JVM, and they pointed out that there really isn't a particularly good place to go for this information. It occurred to me that, really, I had more or less picked up all of it by word of mouth and experience, and there just aren't any good reference sources on the topic. So… here's my word of mouth.

This is by no means a comprehensive gist. It's also important to understand that the techniques that I outline in here are not 100% absolute either. Performance on the JVM is an incredibly complicated subject, and while there are rules that almost always hold true, the "almost" remains very salient. Also, for many or even most applications, there will be other techniques that I'm not mentioning which will have a greater impact. JMH, Java Flight Recorder, and a good profiler are your very best friend! Mea

I had some historical key material data in pkcs#1 format that needed to be in pkcs#8 for input into another system. Here's how to do it, using BouncyCastle:

import org.bouncycastle.asn1.ASN1InputStream;
import org.bouncycastle.asn1.DERObject;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import java.security.PrivateKey;

	# Use ${idea.home.path} macro to specify location relative to IDE installation home.
	# Use ${xxx} where xxx is any Java property (including defined in previous lines of this file) to refer to its value.
	# Note for Windows users: please make sure you're using forward slashes: C:/dir1/dir2.
	ide.app.name=webstorm
	ide.config.home=${user.home}/.jetbrains/${ide.app.name}

	#---------------------------------------------------------------------
	# Uncomment this option if you want to customize a path to the settings directory.
	#---------------------------------------------------------------------
	idea.config.path=${ide.config.home}/config

	-Xms16m
	-Xmx6G
	-XX:ReservedCodeCacheSize=420m
	-XX:+UseNUMA
	-XX:+UseG1GC
	-XX:ConcGCThreads=2
	-XX:+G1UseAdaptiveIHOP
	-XX:+UseGCOverheadLimit
	-XX:MaxMetaspaceSize=2G
	-XX:+ParallelRefProcEnabled

	# See https://docs.oracle.com/javase/8/docs/technotes/tools/windows/java.html
	# See https://docs.oracle.com/javase/8/docs/technotes/guides/vm/performance-enhancements-7.html
	# See https://docs.oracle.com/javase/8/embedded/develop-apps-platforms/codecache.htm
	# See http://normanmaurer.me/blog_in_progress/2013/11/07/Inline-all-the-Things/
	# See http://stas-blogspot.blogspot.com.br/2011/07/most-complete-list-of-xx-options-for.html

	# -XX:+LogCompilation
	# -XX:+PrintInlining

	-Dfile.encoding=UTF-8

	#!/usr/bin/env awk -f

	# Based on the idea from https://blogs.oracle.com/taylor22/entry/using_r_to_analyze_g1gc, the
	# script is updated to use the format of the gc logs as received with the parameters:
	# -XX:+UseThreadPriorities
	# -XX:ThreadPriorityPolicy=42
	# -Xms1995M -Xmx1995M
	# -Xss256k -XX:StringTableSize=1000003
	# -XX:SurvivorRatio=8
	# -XX:MaxTenuringThreshold=1


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