| #!/usr/bin/env ruby | |
| Dir.glob('poly/*.poly').each_slice(50) do |group| | |
| bp_wx = '' | |
| group.each do |poly_file| | |
| file = File.basename(poly_file, '.poly') | |
| city, region = file.split('_') | |
| bp_wx << "--buffer bufferCapacity=50000"\ | |
| " --bp file='poly/#{city}_#{region}.poly'"\ |
| # https://gist.github.com/EdwardDiehl/9c660b59d0fb2e936774ee2c4fcfc792 | |
| # Read and specify ruby version in Gemfile from asdf-vm .tool-versions file. | |
| # Copy the file to your your project root. | |
| # Add these lines at the top of your project Gemfile: | |
| # require './ruby_version.rb' | |
| # ruby ruby_version | |
| def ruby_version(ruby_default_version = '2.5.0') | |
| tool_versions_file = File.join(File.expand_path('..', __FILE__), '.tool-versions') |
Note that for blocks, {} and do ... end are interchangeable. For brevity, only the former will be listed here.
Pre-1.9, lambda and proc are synonyms. Essentially the difference is between proc and block.
def method(&block) p block.class; p block.inspect; end
l = lambda { 5 }
| # http://pdabrowski.com/blog/ruby-on-rails/slow-query-log/ | |
| # config/initializer/slow_query_logger.rb | |
| class SlowQueryLogger | |
| MAX_DURATION = 3.0 | |
| def self.initialize! | |
| ActiveSupport::Notifications.subscribe('sql.active_record') do |name, start, finish, id, payload| | |
| duration = finish.to_f - start.to_f |
parentheses: ( )
braces: { }
brackets: < >
square-brackets: [ ]
| # Related blog post: https://iprog.com/posting/2017/10/benchmarking-geoip-gems | |
| require 'benchmark' | |
| PASS = 1 # 1 or 2 | |
| ### libraries for C extensions | |
| # brew install geoip | |
| # brew install libmaxminddb |
| # CLOSURES IN RUBY Paul Cantrell https://innig.net | |
| # Email: username "paul", domain name "innig.net" | |
| # I recommend executing this file, then reading it alongside its output. | |
| # | |
| # Alteratively, you can give yourself an unreasonable Ruby test by deleting all | |
| # the comments, then trying to guess the output of the code! | |
| # | |
| # (Naive HR departments, please do not use that idea as a hiring quiz.) |
Teh Social Netswork!
CREATE TABLE users (
id SERIAL PRIMARY KEY,
name VARCHAR(10) NOT NULL
);
INSERT into users VALUES
| # Usage: | |
| # | |
| # class Mail | |
| # include SimpleStateMachine | |
| # | |
| # self.initial_state = 'unread' | |
| # self.transitions_map = { | |
| # read: {from: 'unread', to: 'read'}, | |
| # unread: {from: 'any', to: 'unread'}, | |
| # delete: {from: 'any', to: 'deleted'}, |
| module SimpleRailway | |
| class Result | |
| attr_accessor :success, :data | |
| def initialize(success, data) | |
| @success = success | |
| @data = data | |
| end | |
| def success?; !!success; end | |
| def failure?; !success?; end |