How to print from an iPad.
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How to create giant memory leaks in AngularJS (and other client-side JavaScript)
This guide shows how to create an AngularJS application that consumes more and more memory until, eventually, the browser process crashes on your users.
Although this guide has been written for Angular 1 originally, most of the advice is relevant...
Invoices: How to properly round and calculate totals
While it might seem trivial to implement an invoice that sums up items and shows net, gross and vat totals, it actually involves a lot of rules and caveats. It is very easy to create invoices where numbers don't add up and a few cents are missing....
Async control flow in JavaScript: Promises, Microtasks, async/await
Slides for Henning's talk on Sep 21st 2017.
Understanding sync vs. async control flow
Talking to synchronous (or "blocking") API
print('script start')
html = get('/foo')
print(html)
print('s...
The JavaScript Object Model: A deep dive into prototypes and properties
Speaker today is Henning Koch, Head of Development at makandra.
This talk will be in German with English slides.
Introduction
As web developers we work with JavaScript every day, even when our backend code uses anothe...
Best practices: Writing a Rails script (and how to test it)
A Rails script lives in lib/scripts and is run with bin/rails runner lib/scripts/.... They are a simple tool to perform some one-time actions on your Rails application. A Rails script has a few advantages over pasting some prepared code into a R...
PostgreSQL: How to add/remove/modify array values (and how to replace 1 value with multiple values)
PostgreSQL's array data type is pretty useful, but manipulating values of arrays can be awkward because of its syntax.
Consider the following users table which each example below will sta...
How to make Rational#to_s return strings without denominator 1 again
The way Rational#to_s works on Ruby has changed from Ruby 1.9 on. Here is how to get the old behavior back.
You may want this for things where Rationals are being used, like when subtracting Date objects from one another.
What's happening?...
Linux: How to print PDF files from the command line
Sometimes you may want to print files from the command line, especially when you have lots of them.
You can use lp for that.
To print a single example.pdf file on your default printer, simply say:
lp example.pdf
lp accepts multipl...
AngularJS 1: How to keep "ng-hidden" elements from flickering on page load
When you have an element you want to hide, you can add a ng-show='isOpen' attribute to that element. When you set isOpen to false on the scope, the element will be hidden.
However, when you load the page, the element is usually rendered by ...
When sessions, cookies and Clearance tokens expire and how to change it
Expiration of Rails sessions
By default Rails sessions expire when the user closes her browser window.
To change this edit your config/initializers/session_store.rb like this:
ActionController::Base.session = ...