Ian Vaughan IanVaughan

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yes, even hidden code blocks!

print("hello world!")

tmux cheat sheet

(C-x means ctrl+x, M-x means alt+x)

Prefix key

The default prefix is C-b. If you (or your muscle memory) prefer C-a, you need to add this to ~/.tmux.conf:

remap prefix to Control + a

It's important to note that running this reset will drop any existing data you have in the application

How to reset PG Database on Heroku?

Step 1: heroku restart
Step 2: heroku pg:reset DATABASE (no need to change the DATABASE)
Step 3: heroku run rake db:migrate
Step 4: heroku run rake db:seed (if you have seed)

One liner

Misc

CTRL+Q - Turns on flow-control (if you turned it off by mistake)
CTRL+a - increment number
:cw - toggle quickfix list
CTRL+E - scroll window down (cursor stays)
CTRL+Y - scroll window up (cursor stays)
:r - retrive (:r filename - loads file at cursor. :r !ls - loads ls at cur)

Commands

:x - exit (with save)

Ruby 2.0.0 in detail

Keyword arguments

def wrap(string, before: "<", after: ">")
  "#{before}#{string}#{after}" # no need to retrieve options from a hash
end

# optional

AYB12

Alvin Richards: MongoDB

Trade-off: scale vs. functionality. MongoDB tries to have good functionality and good scalability.
Auto-sharding to maintain equilibrium between shards
Scalable datastore != scalable application: use of datastore may still be non-scalable (e.g. many queries across all shards)
Get low latency by ensuring shard data is always in memory: datastore

Locate the section for your github remote in the .git/config file. It looks like this:

[remote "origin"]
	fetch = +refs/heads/*:refs/remotes/origin/*
	url = [email protected]:joyent/node.git

Now add the line fetch = +refs/pull/*/head:refs/remotes/origin/pr/* to this section. Obviously, change the github url to match your project's URL. It ends up looking like this:

	#!/usr/bin/env ruby
	# frozen_string_literal: true

	require 'simplecov'
	require 'simplecov-lcov'

	puts('Merging coverage results from parallel CircleCI tests containers into a single LCOV report...')

	results = []
	Dir['/home/circleci/rspec/*.resultset.json'].each do \|path\|

	#
	# This first version should work on Mac OS X and Linux, but it spawns a process
	#
	# http://stackoverflow.com/questions/7220896/
	# https://github.com/rdp/os/blob/master/lib/os.rb#L127
	# http://www.ruby-doc.org/core-2.0/Process.html
	#
	# A better - but more complicated - way to achieve the same is documented here:
	#
	# https://build.betterup.com/tracking-a-processs-memory-usage-in-ruby/

	# abort if already under tmux
	[[ -n $TMUX_PANE ]] && return

	# zsh-specific includes
	zmodload -i zsh/datetime
	zmodload -i zsh/stat

	# place to store the chart
	RAINBARF_OUT=~/.rainbarf.out
	# update period, in seconds