Kotlin js : hack to get the values of an unknown enum

By LiBePosted on Friday 29 June 2018Friday 29 June 2018Cat G33k, ProgrammesLeave a comment

Kotlin js is really experimental and does not allow a lot of things when it comes to reflect apis : actually you can only read the class name or cast the value into a dynamic (javascript-like) object. Ever wondered how to do call myEnum.values() in js without knowing the type ? Not permitted so far,… Read More »

A PWA that sounds more App than Web

By LiBePosted on Thursday 31 May 2018Thursday 31 May 2018Cat G33k, ProgrammesLeave a comment

A Progressive Web App is a set of rules that comply with the display of a WebApp in a standalone or minimalist view. Pick up your web application, remove the bar address and the menu (optionally), and try to figure out how the user can interact with your application as if the client was not… Read More »

spring-boot : differences in my yaml files

By LiBePosted on Monday 30 April 2018Monday 30 April 2018Cat G33k, ProgrammesLeave a comment

During the release process, there is a tricky part that can sometimes ask for production hot fixes : "Are you sure that all the yaml configuration files are even between the various environments ?" What are we talking about ? Discrepancies between configuration files in each environment. That happens more often than you think, and… Read More »

Properties to JsonNode

By LiBePosted on Saturday 31 March 2018Wednesday 4 April 2018Cat G33k, ProgrammesLeave a comment

How difficult do you find it to convert properties into a json object ? It would require a lot of boilerplate work in java, but it is easier in kotlin. This snippet reads a Map of properties paths and values and converts them into a json node (or a map of maps (of maps...) of… Read More »

aws lambda in pictures

By LiBePosted on Wednesday 28 February 2018Wednesday 28 February 2018Cat G33k, ProgrammesLeave a comment

A lambda function is a cost saver. You can save - some virtual machines (they are managed by the IaaS itself) - some setup (the API interface is the code itself) - some maintenance cost (the function will live forever and you control the downtime if you need some) Do you want to build an… Read More »

A gtfs server in 5 minutes

By LiBePosted on Wednesday 31 January 2018Wednesday 31 January 2018Cat G33k, ProgrammesLeave a comment

Want to be able to serve the schedules of any railway / bus company ? Some providers already exist (starting by google of course) and allow you to do so... with a pricing table and a very low free tier quota. There are two ways to get rid of this limitation : buy the paid… Read More »

react native fab : round button

By LiBePosted on Thursday 28 December 2017Thursday 28 December 2017Cat G33k, ProgrammesLeave a comment

Quite hard to integrate a Floating action button into react native. Especially when your app is fusion = has react-native-web but can also be displayed on a desktop. You cannot react-native link on a webapp and you cannot render anything based on native implementation. What can you do to easily have a FAB ready to… Read More »

Benchmarkjs : a very small tool to compare speed

By LiBePosted on Wednesday 29 November 2017Cat G33k, ProgrammesLeave a comment

Wanting to quickly figure out which way is the fastest ? Want to see median times in µs ? Download that module : https://gist.github.com/libetl/952e026f889be1cc7cdb3b42767ea845 And call benchmark that way : (copy/paste that code, change 'forThisWork' - what to measure, 'theContestants '- who to measure, and 'seedInit' - what data should it use) benchmark({theContestants: {naive: seed… Read More »

How to crash javac (jdk8) for free

By LiBePosted on Friday 13 October 2017Cat G33k, ProgrammesLeave a comment

This simple snippet can cause javac (from the JDK 8) to crash : public class TestExtendConsumer { @FunctionalInterface public interface NumberConsumer< E extends Number> extends java.util.function.Consumer< E>{void accept(E number);} private static < E extends Number> void extend(E number) { System.out.println(number); } public static void main(String[] args) { NumberConsumer numberConsumer = TestExtendConsumer::extend; numberConsumer.accept(1); } } Impressive.… Read More »

Raw js imported as a real module

By LiBePosted on Saturday 16 September 2017Saturday 16 September 2017Cat G33k, ProgrammesLeave a comment

Modern javascript libraries are all made of modules. They can be plugged inside any project : web, server, batch or program. That would be really straightforward to include any dependency as a single line of configuration inside a package.json file. Unfortunately, some teams want to expose web javascript code in a raw format : no… Read More »