Adry Happier adryhappier

[OUTDATED] Install NVM, NodeJS, Yarn via Homebrew

WARNING

Dear all Github friends,

I moved this gist to the Github repository.

Following this repository https://github.com/nijicha/install_nodejs_and_yarn_homebrew

`vs` Questions

http://stackoverflow.com/questions/804115 (rebase vs merge).
https://www.atlassian.com/git/tutorials/merging-vs-rebasing (rebase vs merge)
https://www.atlassian.com/git/tutorials/undoing-changes/ (reset vs checkout vs revert)
http://stackoverflow.com/questions/2221658 (HEAD^ vs HEAD~) (See git rev-parse)
http://stackoverflow.com/questions/292357 (pull vs fetch)
http://stackoverflow.com/questions/39651 (stash vs branch)
http://stackoverflow.com/questions/8358035 (reset vs checkout vs revert)

How to update the Go version

System: Debian/Ubuntu/Fedora. Might work for others as well.

1. Uninstall the exisiting version

As mentioned here, to update a go version you will first need to uninstall the original version.

To uninstall, delete the /usr/local/go directory by:

Code is clean if it can be understood easily – by everyone on the team. Clean code can be read and enhanced by a developer other than its original author. With understandability comes readability, changeability, extensibility and maintainability.

General rules

Follow standard conventions.
Keep it simple stupid. Simpler is always better. Reduce complexity as much as possible.
Boy scout rule. Leave the campground cleaner than you found it.
Always find root cause. Always look for the root cause of a problem.

Design rules

Optimistic Locking assumes that a database transaction conflict is very rare to happen. It uses a version number of the record to track the changes. It raise an error when other user tries to update the record while it is lock.

usage

Just add a lock_version column to the table you want to place the lock and Rails will automatically check this column before updating the record.

Pessimistic locking assumes that database transaction conflict is very likely to happen. It locks the record until the transaction is done. If the record is currently lock and the other user make a transaction, that second transaction will wait until the lock in first transaction is release.

usage

Revert the full commit

Sometimes you may want to undo a whole commit with all changes. Instead of going through all the changes manually, you can simply tell git to revert a commit, which does not even have to be the last one. Reverting a commit means to create a new commit that undoes all changes that were made in the bad commit. Just like above, the bad commit remains there, but it no longer affects the the current master and any future commits on top of it.

git revert {commit_id}

About History Rewriting

Delete the last commit

Deleting the last commit is the easiest case. Let's say we have a remote origin with branch master that currently points to commit dd61ab32. We want to remove the top commit. Translated to git terminology, we want to force the master branch of the origin remote repository to the parent of dd61ab32:

	const AWS = require("aws-sdk"); // from AWS SDK
	const fs = require("fs"); // from node.js
	const path = require("path"); // from node.js

	// configuration
	const config = {
	s3BucketName: 'your.s3.bucket.name',
	folderPath: '../dist' // path relative script's location
	};

	module.exports = {
	config: {
	// default font size in pixels for all tabs
	fontSize: 12,

	// font family with optional fallbacks
	fontFamily: 'Menlo, "DejaVu Sans Mono", Consolas, "Lucida Console", monospace',

	// terminal cursor background color and opacity (hex, rgb, hsl, hsv, hwb or cmyk)
	cursorColor: 'rgba(248,28,229,0.8)',

	// 🔥 Node 7.6 has async/await! Here is a quick run down on how async/await works

	const axios = require('axios'); // promised based requests - like fetch()

	function getCoffee() {
	return new Promise(resolve => {
	setTimeout(() => resolve('☕'), 2000); // it takes 2 seconds to make coffee
	});
	}

	#
	# Sidekiq auto start using systemd unit file for Ubuntu 16.04
	#
	# Put this in /lib/systemd/system (Ubuntu).
	# Run:
	# 1. systemctl enable sidekiq (to enable sidekiq service)
	# 2. systemctl {start,stop,restart} sidekiq (to start sidekiq service)
	#
	# This file corresponds to a single Sidekiq process. Add multiple copies
	# to run multiple processes (sidekiq-1, sidekiq-2, etc).