rankitranjan

# delete local tag '12345'
git tag -d 12345
# delete remote tag '12345' (eg, GitHub version too)
git push origin :refs/tags/12345
# alternative approach
git push --delete origin tagName
git tag -d tagName

rankitranjan

1) Create a branch with the tag
	git branch {tagname}-branch {tagname}
	git checkout {tagname}-branch

2) Include the fix manually if it's just a change .... 
	git add .
	git ci -m "Fix included"
    or cherry-pick the commit, whatever is easier
	git cherry-pick  {num_commit}
	

rankitranjan

I think from personal observation that most of them do:

1) Start going in the direction of the first button pressed, keep track of which direction we're going
2) When a floor is reached and that button was pressed, stop and open the doors, mark the buttons for this floor as
not pressed anymore.
3) If there are still more floors that we need to visit that are in the same direction, keep going in that direction.
   If not and there are still floors we need to visit, move in that direction. (with help of cameras we can avoid this
   scenario, if lift is empty), If not then we're done and will start at 1 when a button is pressed again.

rankitranjan

module A
	
	def self.included(base)
		base.extend(ClassMethods)
	end

	module ClassMethods
	    def all
	      p 'all'
	    end

rankitranjan

class User < ActiveRecord::Base
	has_many :follows
	delegate :following, :follower, to: :follows
end

class Follow < ActiveRecord::Base
	scope :following, -> { where(type: 'following') }
	scope :follower, -> { where(type: 'follower') }
end

rankitranjan

# How to Install RVM, Ruby, and Gems without Xcode Command Line Tools
# ===================================================================
#
# Mac OS X 10.8.2 (12C60) (Mountain Lion)
# Xcode 4.5 (4G182)
#
# While attempting to `rvm pkg install openssl`, I had encountered the error:
# > cryptlib.h:62:20: error: stdlib.h: No such file or directory
# But, the commands & ouput below show how I worked around the issue.
#

rankitranjan

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

rankitranjan

class Node {
  constructor(value) {
    this.value = value;
    this.next = null;
  }
}

class Queue {
  constructor(){
    this.first = null;

rankitranjan

class Node {
  constructor(value) {
    this.value = value;
    this.next = null;
  }
}

class Queue {
  constructor(){
    this.first = null;

rankitranjan

// using LinkedList

class Node {
  constructor(value) {
    this.value = value;
    this.next = null;
  };
}

class Stack {