Yurii D. dgroup

Meeting notes

Links to webminar on Youtube or vk.com

Library or service	Description
http://bower.io	Package manager for js
http://momentjs.com	Parse, validate, manipulate, and display dates in js
http://underscorejs.org	A lot of util functions. Functional-style development
https://lodash.com	Fast underscorejs

PSQL

psql -U postgres

If run with -E flag, it will describe the underlaying queries of the \ commands (cool for learning!).

Most \d commands support additional param of __schema__.name__ and accept wildcards like *.*

Command	Description

  ### Quick Start

  git clone <url>                 # Clone directory
  git checkout -b <new-branch>    # Create new local branch
  git push -u origin <new-branch> # Sync local branch with remote
  git checkout <branch>           # Checkout branch
  git push origin <branch>        # Push branch to remote

Introduction

C-a == Ctrl-a
M-a == Alt-a

General

:q        close
:w        write/saves
:wa[!]    write/save all windows [force]
:wq       write/save and close

#
# Docker
#

docker start <container_name>               # start particular container
docker start -i <container_name>            # start particular container in interactive mode
docker stop <container_name>                # stop particular container
docker ps                                   # display all running containers
docker ps -a # display all existing containers (stopped)

About `PrintCompilation`

This note tries to document the output of PrintCompilation flag in HotSpot VM. It was originally intended to be a reply to a blog post on PrintCompilation from Stephen Colebourne. It's kind of grown too big to fit as a reply, so I'm putting it here.

Written by: Kris Mok rednaxelafx@gmail.com

Most of the contents in this note are based on my reading of HotSpot source code from OpenJDK and experimenting with the VM flags; otheres come from HotSpot mailing lists and other reading materials listed in the "References" section.

This

Install the JMC on OSX 10.14.2, Java HotSpot(TM) 64-Bit Server VM (build 25.181-b13, mixed mode)

Download the swt cocoa jar from here.

Go to JDKs jmc path (You can find this path by right-clicking on jmc icon in the dock -> Options -> Show in Finder, Then right click on App -> Show Package Contents). For example:

cd /Library/Java/JavaVirtualMachines/jdk<version>.jdk/Contents/Home/lib/missioncontrol
# Back up exisiting jar using 
sudo mv plugins/org.eclipse.swt.cocoa.macosx.x86_64_3.103.1.v20140903-1947.jar ../
# Copy downloaded zip's swt.jar using 
sudo cp ~/Downloads/swt.jar plugins/org.eclipse.swt.cocoa.macosx.x86_64_3.103.1.v20140903-1947.jar

Download from https://www.eclipse.org/mat/downloads.php the OSX distributive http://www.eclipse.org/downloads/download.php?file=/mat/1.8.1/rcp/MemoryAnalyzer-1.8.1.20180910-macosx.cocoa.x86_64.zip
Unzip the archive to folder ($OSX_MAT_HOME)
Open the root folder with binary $OSX_MAT_HOME/mat.app/Contents/MacOS
```
12:56:03 MacOS $ ls
MemoryAnalyzer		MemoryAnalyzer.ini	workspace
```

How to update the copyright for files in ruby project? https://github.com/barrydrink/LicenceInjector/blob/master/bin/licence_injector https://gist.github.com/lbvf50mobile/4296b1a66872620deaf2c30f94e09ccb
Bundler: why do we need it? https://bundler.io/ Install all of the required gems from your specified sources:

$ bundle install
$ git add Gemfile Gemfile.lock

	var db = require('db'); // if 'ru.js' not found, NodeJS will automatically found ru.json/ru.node/'ru' directory
	var log = require('logger')(module);

	function User(name){
	this.name = name
	}

	User.prototype.hello = function (who) {
	log(db.getPhrase("Hello") +' '+ who.name)
	};