sanjeev2838

Bash Shortcuts

Moving

command	description
ctrl + a	Goto BEGINNING of command line

sanjeev2838

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

sanjeev2838

Quick notes

Code School - Rails Patterns

Info

• Course: https://www.codeschool.com/courses/rails-4-patterns
• Slides: http://courseware.codeschool.com.s3.amazonaws.com/rails4patterns/rails_4_patterns.pdf

Notes

• guard clause - http://www.thechrisoshow.com/2009/02/16/using-guard-clauses-in-your-ruby-code/
• scopes always return a chainable object!

sanjeev2838

In some cases, only these lines will work

for product in IntelliJIdea WebStorm DataGrip PhpStorm CLion PyCharm GoLand RubyMine; do
    rm -rf ~/.config/$product*/eval 2> /dev/null
    rm -rf ~/.config/JetBrains/$product*/eval 2> /dev/null
done

But if not, try these

sanjeev2838

Tabs and Windows

Function	Shortcut
New Tab	⌘ + T
Close Tab or Window	⌘ + W (same as many mac apps)
Go to Tab	⌘ + Number Key (ie: ⌘2 is 2nd tab)
Go to Split Pane by Direction	⌘ + Option + Arrow Key
Cycle iTerm Windows	⌘ + backtick (true of all mac apps and works with desktops/mission control)

sanjeev2838

columns_that_make_record_distinct = [:some_id, :another_name]
distinct_ids = Model.select("MIN(id) as id").group(columns_that_make_record_distinct).map(&:id)

duplicate_records = Model.where.not(id: distinct_ids)

sanjeev2838

class Array
  def self.toy(n=10, &block)
    block_given? ? Array.new(n,&block) : Array.new(n) {|i| i+1}
  end
end

class Hash
  def self.toy(n=10)
    Hash[Array.toy(n).zip(Array.toy(n){|c| (96+(c+1)).chr})]
  end

sanjeev2838

rubocop -a `git diff --name-only --cached | grep '\.rb'`

sanjeev2838

FWIW: I didn't produce the content presented here (the outline from Edmond Lau's book). I've just copy-pasted it from somewhere over the Internet, but I cannot remember what exactly the original source is. I was also not able to find the author's name, so I cannot give him/her the proper credits.

---

Effective Engineer - Notes

• By Edmond Lau
• Highly Recommended 👍
• http://www.theeffectiveengineer.com/

What's an Effective Engineer?

sanjeev2838

#!/usr/bin/env bash

# $ crontab -e
# 0 0 25 * * * ~/bin/rubymine-reset-eval.sh

# Directories
LIB=${HOME}/Library
PREFS=${LIB}/Preferences
CACHE=${LIB}/Caches
ASUPP=${LIB}/Application\ Support