- Dynamic Dispatch
- Dynamic Method
- Ghost Methods
- Dynamic Proxies
- Blank Slate
- Kernel Method
- Flattening the Scope (aka Nested Lexical Scopes)
- Context Probe
- Class Eval (not really a 'spell' more just a demonstration of its usage)
- Class Macros
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# https://help.github.com/articles/changing-author-info/ | |
#!/bin/sh | |
# remove backup | |
rm -f .git/refs/original/refs/heads/master | |
git filter-branch --env-filter ' | |
OLD_EMAIL="old@email.com" | |
CORRECT_NAME="Your Name" |
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" _ _ " | |
" _ /|| . . ||\ _ " | |
" ( } \||D ' ' ' C||/ { % " | |
" | /\__,=_[_] ' . . ' [_]_=,__/\ |" | |
" |_\_ |----| |----| _/_|" | |
" | |/ | | | | \| |" | |
" | /_ | | | | _\ |" | |
It is all fun and games until someone gets hacked! |
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def anagram? a, b | |
counts = ->(word) { word.each_char.with_object(Hash.new(0)) { |c, h| h[c] += 1 unless c =~ /\s/} } | |
counts[a] == counts[b] | |
end |
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module Carousel | |
class Reorder | |
extend Dry::Initializer | |
include Dry::Monads::Either::Mixin | |
param :scope, reader: :private | |
param :params, reader: :private | |
def call | |
context = OpenStruct.new( |
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# kill by port | |
sudo kill -9 $(lsof -i :3000 -t) | |
# wget with range | |
wget --user user --password password http://example.com/{0..n}.jpg | |
# scp | |
scp dev@123.123.123.123:projects/dev.log /home/dev/dev.log | |
# Bulk rename |
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group.admins << user | |
user.admin? # => true | |
user.editor? # => false | |
class Group < ActiveRecord::Base | |
has_many :memberships | |
has_many :users, :through => :memberships | |
has_many :admins, :through => :memberships, :source => :user, | |
:conditions => "memberships.role = 'admin'" do |
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class Class | |
def new(*args, &block) | |
obj = allocate | |
obj.initialize(*args, &block) | |
# actually, this is obj.send(:initialize, …) because initialize is private | |
obj | |
end | |
end |
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convert -strip -interlace Plane -gaussian-blur 0.05 -quality 85% source.jpg result.jpg |
Command Line
pry -r ./config/app_init_file.rb
- load your app into a pry session (look at the file loaded by config.ru)pry -r ./config/environment.rb
- load your rails into a pry session
Debugger
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