Bayes’ Theorem
Imagine that you come home from a party and you are stopped by the police. They ask you to take a drug test and you accept. The test result is positive. You are guilty. But wait a minute! Is it really that simple?
Versioning Software – Semantic Versioning vs. Product Versioning
Keep it simple, stupid! When we first released our tool to the end user, we proudly named it v1.0.0. This is called semantic versioning – major.minor.patch Makes sense for libraries where a minor change e.g. 1.0.0 to 1.1.0 means interface compatibility, just some new functions. A major change e.g. 1.0.0 to 2.0.0 means “Attention, I…
ES6: var vs let vs const
Dealing with KnockoutJS I came across some newer features of the JavaScript language ES6 TL;DR: don’t use var anymore when You declare variables. Some examples:
Python 3 – there shall be just int
Trying to contribute to the Flask plugin flask-login I just added these lines: if isinstance(duration, (int, long)): duration = timedelta(seconds=duration) Looking quite plausible, isn’t it? But lo and behold: it doesn’t work under Python 3.x. Dang! The reason: Python 2 has two integer types: int and long. In Python 3 there is only int, which…
Lint your JavaScript with grunt and jshint
After I’ve introduced You to Yarn I will show You more client side tools in this post. Grunt is a task runner which comes in handy for a lot of setup and configuring work e.g. concatenating and minimizing JavaScript or CSS files To get started You can add grunt via yarn to your project yarn…
Yarn – An alternative package manager for node.js
Fiddling around with the wire webapp which is available on GitHub I came across yarn. Yarn is a package manager like npm which accesses the same repositories. The design goals are reproducibility of builds, speed and security. Installation npm install -g yarn or on macOS
Firefox: Enable Spellchecking in Single Line Fields
Motivation Good writing is key for a software developer as I stated in Writing as a complementary skill for your SW engineering career So when you are writing a lot of texts in the browser e.g. in a wiki or an issue tracker you definitely want a spellchecker enabled. For some reasons Firefox distinguishes between…
Regular Expressions Demystified – A Mini DSL for Regex in Python
Motivation Every Junior Developer needs some pet projects to try out some techniques he or she is not familiar with already. Because I’ve always had a hard time with regular expressions (I know that they are useful, but I use them so rarely that I cannot get a hold of all the syntax) I’ve started…
Node.js with PyCharm
PyCharm amazes me every time. Although it is first and foremost a python IDE you can do full stack web development with it, i. e. you have code completion for HTML, CSS, JavaScript and even TypeScript, CoffeeScript. I wanted to code some node.js stuff and Jetbrains already got a plugin for PyCharm. Before installation: https://www.jetbrains.com/help/pycharm/2017.1/node-js-and-npm.html…
Division in Python 2 vs 3
One major change in Python 3 is the implementation of the division operator /. In Python 2 the division yielded a floor rounded integer when dividing two integers but a float when using a float as divider or divisor. Due to Python’s weakly typed nature this behavior could lead to some issues. So PEP-238 changed…