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Coding

Ever since I advanced beyond the “hello worlds” of Java, I had never stopped coding. This section is for documenting code usages that I had employed while solving the technological problems that I had encountered.

How to detect keyboard presses made to the browser screen with JavaScript

When you are building a browser-based game, being able to track key presses is helpful.

For this purpose, you can register a JavaScript function that gets called when the browser detects a key is being pressed.

After the browser detects a key press, it will send information about the key to your function.

When your function is able to get the key that is pressed, it can then use this information to update the game state.

In this post, let’s look at how we can detect keyboard presses made to the browser screen with JavaScript.

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How to control a SG90 servo motor with the ESP8266 NodeMCU LUA Development Board

When you are looking to operate remote-controlled or radio-controlled toy cars, robots and airplanes, you will need to use servo motors.

Since the ESP8266 NodeMCU LUA Development Board is cost efficient for IOT solutions, it can be used for controlling servo motors.

So how can we control a servo motor with the ESP8266 NodeMCU LUA Development Board?

This post discusses how we can control the SG90 servo motor, with the ESP8266 NodeMCU LUA Development Board.

Getting the environment variables supplied to your Cloud Foundry application with Python 3 Flask

When I was trying to build a Python 3 Flask application on Cloud Foundry, I wanted to quickly check the environment variables that Cloud Foundry will supply to my application.

As a result of that, I created a Python 3 Flask application that will probe the environment variables that it receives from Cloud Foundry.

This post lists the files that constitute that Python 3 Flask application.

How to download a file via HTTP GET and HTTP POST in Java without using any external libraries

Apart from uploading a file to a HTTP server endpoint, another common task for a Java HTTP client is to download a file from a HTTP server. Even though there are many Java external libraries to help us do so, using the facilities in the Java standard runtime installation is not difficult. Furthermore, we will be able to keep our Java application leaner if we can download files without additional dependencies.

In case you need a reference, this is how to download a file via HTTP GET and HTTP POST in Java without using any external libraries.