There was a [great article][1] about how react implements it's virtual DOM. There are some really interesting ideas in there but they are deeply buried in the implementation of the React framework.
However, it's possible to implement just the virtual DOM and diff algorithm on it's own as a set of independent modules.
| #301 Redirects for .htaccess | |
| #Redirect a single page: | |
| Redirect 301 /pagename.php http://www.domain.com/pagename.html | |
| #Redirect an entire site: | |
| Redirect 301 / http://www.domain.com/ | |
| #Redirect an entire site to a sub folder | |
| Redirect 301 / http://www.domain.com/subfolder/ |
| import cv2.cv as cv | |
| import tesseract | |
| gray = cv.LoadImage('captcha.jpeg', cv.CV_LOAD_IMAGE_GRAYSCALE) | |
| cv.Threshold(gray, gray, 231, 255, cv.CV_THRESH_BINARY) | |
| api = tesseract.TessBaseAPI() | |
| api.Init(".","eng",tesseract.OEM_DEFAULT) | |
| api.SetVariable("tessedit_char_whitelist", "0123456789abcdefghijklmnopqrstuvwxyz") | |
| api.SetPageSegMode(tesseract.PSM_SINGLE_WORD) | |
| tesseract.SetCvImage(gray,api) | |
| print api.GetUTF8Text() |
Originally published in June 2008
When hiring Ruby on Rails programmers, knowing the right questions to ask during an interview was a real challenge for me at first. In 30 minutes or less, it's difficult to get a solid read on a candidate's skill set without looking at code they've previously written. And in the corporate/enterprise world, I often don't have access to their previous work.
To ensure we hired competent ruby developers at my last job, I created a list of 15 ruby questions -- a ruby measuring stick if you will -- to select the cream of the crop that walked through our doors.
Candidates will typically give you a range of responses based on their experience and personality. So it's up to you to decide the correctness of their answer.
This list is based on aliases_spec.rb.
You can see also Module: RSpec::Matchers API.
| matcher | aliased to | description |
|---|---|---|
| a_truthy_value | be_truthy | a truthy value |
| a_falsey_value | be_falsey | a falsey value |
| be_falsy | be_falsey | be falsy |
| a_falsy_value | be_falsey | a falsy value |
| # Simple approach to sending email from the Rails console | |
| # Implementation idea courtesy of Steve Klabnik | |
| # http://blog.steveklabnik.com/posts/2012-09-09-random-ruby-tricks--class-new | |
| # Create the mailer class with a block and assign to a variable | |
| mailer = Class.new(ActionMailer::Base) do | |
| def example_message | |
| mail(to: "[email protected]", from: "[email protected]", subject: "Example Message") do |format| | |
| format.text { render text: "Example message body" } | |
| end |
| AWS region code | AWS region name | Number of AZs | AZ names |
|---|---|---|---|
| us-east-1 | Virginia | 4 | us-east-1a, us-east-1b, us-east-1c, us-east-1e |
| us-west-1 | N. California | 2 | us-west-1a, us-west-1b |
| us-west-2 | Oregon | 3 | us-west-2a, us-west-2b, us-west-2c |
| eu-west-1 | Ireland | 3 | eu-west-1a, eu-west-1b, eu-west-1c |
| eu-central-1 | Frankfurt | 2 | eu-central-1a, eu-central-1b |
| ap-southeast-1 | Singapore | 2 | ap-southeast-1a, ap-southeast-1b |
| ap-southeast-2 | Sydney | 2 | ap-southeast-2a, ap-southeast-2b, ap-southeast-2c |
| ap-northeast-1 | Tokyo | 2 | ap-northeast-1a, ap-nort |
This procedure explains how to install MySQL using Homebrew on macOS Sierra 10.12
$ /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"At this time of writing, Homebrew has MySQL version 5.7.15 as default formulae in its main repository :
| <?php | |
| $cb = function ($fn) { | |
| return $fn; | |
| }; | |
| echo <<<HEREDOC | |
| Hello, {$cb(ucfirst('world'))} | |
| HEREDOC; |
TL;DR
Install Postgres 9.5, and then:
sudo pg_dropcluster 9.5 main --stop
sudo pg_upgradecluster 9.3 main
sudo pg_dropcluster 9.3 main