wrburgess

RBENV

• rbenv install -l
• rbenv install 2.6.5
• rbenv local 2.6.5
• gem install bundler
• bundle install

RVM

tnguyen14

When you modify a file in your repository, the change is initially unstaged. In order to commit it, you must stage it—that is, add it to the index—using git add. When you make a commit, the changes that are committed are those that have been added to the index.

git reset changes, at minimum, where your current branch is pointing. The difference between --mixed and --soft is whether or not your index is also modified. So, if we're on branch master with this series of commits:

- A - B - C (master)

HEADpoints to C and the index matches C.

--soft

stonehippo

Install a new Ruby with rbenv on Mac OS (and make yourself a superhero)

If you're doing stuff with Ruby on a Mac, e.g. installling Jekyll or something, by default you'll end up having to use the sudo command to do stuff, since the permission to modify the default config is not available to your user account.

This sucks and should be avoided. Here's how to fix that.

Installing a new Ruby

To make this better, we are going install a new, custom Ruby. This used to be a big, scary thing, but thanks to the awesome tools Homebrew and rbenv, it's a snap.*

A word of warning: you will have to use Terminal to install this stuff. If you are uncomfortable with text, words, and doing stuff with your computer beyond pointing and hoping, this may not work well for you. But if that's the case, I'm not sure why you were trying to use Ruby in the first place.

tsiege

ANNOUNCEMENT

I have moved this over to the Tech Interview Cheat Sheet Repo and has been expanded and even has code challenges you can run and practice against!






\

davidbauer

#!/usr/bin/env python

# assuming a csv file with a name in column 0 and the image url in column 1

import urllib

filename = "images"

# open file to read
with open("{0}.csv".format(filename), 'r') as csvfile:

christianesperar

class Integer
    def factorial
        result = 0
        self.downto(1) { |number| result == 0 ? result = number : result *= number }
        return result
    end
end 

cowboy-cod3r

#!/opt/apps/ruby/ruby/bin/ruby
require 'date'

# The initial date format as a String
my_date = "2013-10-03 21:03:46Z"

# Convert the Date to a DateTime Object
date_obj = DateTime.strptime(my_date,'%Y-%m-%d %H:%M:%S%Z')

# Re-Format the date - returns a String

itsmattsoria

SHORTCUTS

Key/Command	Description
Tab	Auto-complete files and folder names
Ctrl + A	Go to the beginning of the line you are currently typing on
Ctrl + E	Go to the end of the line you are currently typing on
Ctrl + U	Clear the line before the cursor
Ctrl + K	Clear the line after the cursor
Ctrl + W	Delete the word before the cursor
Ctrl + T	Swap the last two characters before the cursor

stevenyap

Gemfile

gem 'simple_form'

Installation

rails generate simple_form:install

clarkdave

# 
# This will force ActiveRecord to create proper `interval` column types in PostgreSQL
#
# def change
#   add_column :leases, :period, :interval
# end
#
# This applies to a generated `schema.rb` file too.
#
# No special OID type is applied to an `interval` type. Rails will treat it as a string, although