.env.development Jun 2026

Contents

JavaScript Abacus
Android Abacus
Java Abacus
X Abacus (UNIX, VMS and Windows too)
Notes

JavaScript Abacus

(Missing your favorite?... let me know)
Abaci from around the world and long ago Different Abacus Configurations using JavaScript
Configurations JS
Chinese Abacus *
(Suanpan)
Chinese Abacus with trial TEACH mode
Korean Abacus *
(Jupan, AKA Japanese
Soroban pre-WWII)
Korean Abacus
Japanese Abacus *
(Soroban post-WWII)
Japanese Abacus
Roman Hand Abacus *
right most column twelfths and
Ancient Roman Numerals in display
Roman Hand Abacus
Roman Hand Abacus *
right most column eighths and
Modern Roman Numerals on abacus
Roman Hand Abacus (8)
Ivory Roman Hand Abacus *
from 2nd - 5th Century
Ivory Roman Hand Abacus
Russian Abacus *
(Schoty)
Russian Abacus
Old Russian Abacus *
(Schoty w/ 1/4 Kopek)
Old Russian Abacus
Danish School Abacus * Danish Abacus
Medieval Counters * Medieval Counter
British Abacus *
An abacus from the British Museum
from the 17th century
British Abacus
Vietnamese Abacus *
(unusual example as normally
of Chinese-Japanese type)
Vietnamese Abacus
Base 16 Japanese Abacus * Base 16 Abacus
Chinese Abacus *
(base 16)
Chinese Base 16 Abacus
Reconfigured Abacus to represent
Chinese Solid-And-Broken-Bar System *
(base 12)
Early Chinese Numbering
Mesoamerican Abacus *
(Nepohualtzintzin,
similar to a Soroban base 20)
Mesoamerican Abacus
Calendar Mesoamerican Abacus
(Nepohualtzintzin)
Calendar Mesoamerican Abacus
Sumerian Abacus
(reconstruction as no examples
or diagrams exist from era)
Sumerian Abacus
Base 2 Abacus Base 2 Abacus
Georgian Abacus *
(Russian base 20, for warmer climate
(no shoes), do not take seriously)
Georgian Abacus
US Currency
Dollar
US Currency
European Currency
Euro
European Currency
Counters with British Currency
Pound
British Currency
British Currency
Pound
British Currency
Japanese Currency
Yen
Japanese Currency
South Korean Currency
Won
South Korean Currency
Russian Currency
Ruble
Russian Currency
Old Russian Currency
Ruble
Old Russian Currency
Lee's Abacus *
Principal Chinese with a Nonevenly
Distributed 7/13 Rail Auxiliary
Lee Abacus Noneven CN
Lee's Abacus *
Principal Korean with a Nonevenly
Distributed 7/11 Rail Auxiliary
Lee Abacus Noneven KO
Lee's Abacus *
Principal Chinese with a Evenly
Distributed 9 Rail Auxiliary
Lee Abacus Even CN
Those with a "*" above have a "Teach" mode for addition, subtraction and just added multiplication, division, square root and cube root. Multiplication, division, and roots works best on "Lee" versions as they can hold values in auxiliary abacii.

Now with beginnings of some language support for French, Spanish, Dutch, German, Norwegian, Russian (I need help from translators see line 72 or so of abacus.js). It is all driven by a single JavaScript program with input parameters in the html.

Let me know of any bugs... (yes, the Lee's Abaci has some alignment issues if you change number of rails). If there is a abacus design not featured that you want to see, let me know. The Java below has more features (and no alignment issues), but can no longer run in your browser ... sigh.

See project notes for todo list and history.


Android Abacus

Abacus for my phone Abacus Implementation for Android
Icon Source Code Executable
Abacus.zip Abacus.apk

Unzip somewhere and then put in Eclipse like File->Project->Android Project from Existing Code. Then build, install, and run as usual. Any trouble building and getting on your Android, let me know so I can make fixes or better instructions.

See project notes for todo list and history.


Java Abacus

java -jar AbacusApp.jar -lee=1
Screenshot shown here running as: "java -jar AbacusApp.jar -lee=1"

.env.development Jun 2026

Multiple .env files, encrypting secrets, and committing .env to code

This ensures new developers can get started immediately without hunting down configuration values from team members.

When a build tool or framework initializes, a specific loading order determines which values take precedence. Generally, local override files ( .env.development.local ) override environment-specific files ( .env.development ), which in turn override the generic fallback file ( .env ). File Syntax Rules

Local overrides across all environments (except sometimes testing). Never committed to git.

: Even though it's "for development," you must never include real secrets (like production database passwords or private API keys) in this file if it is committed to GitHub. .env.development

A .env.development file is a plain text file located in the root of a project. It is used to define environment variables that are only active when the application is running in the environment.

However, hardcoding localhost in production would be catastrophic. This is where environment-specific files shine.

) and commit that to Git so other developers know which variables they need to set up. Precedence : In most modern tooling (like Vite or Next.js), .env.development values will be overridden by .env.development.local if both exist. Are you setting this up for a specific Adding Custom Environment Variables - Create React App

: Vite requires the VITE_ prefix; any other prefix won't be exposed to client-side code. Multiple

: For development mode ( npm start ), files load in the following order of priority: .env.development.local (highest priority) → .env.development → .env.local → .env (lowest priority).

Access the variables using process.env in Node-based projects: javascript

Use python-dotenv or django-environ .

Enter the file system. Specifically, the .env.development file serves as the cornerstone of local development workflows, allowing developers to manage environment-specific variables seamlessly. What is a .env.development File? File Syntax Rules Local overrides across all environments

Key capabilities

. By separating execution configurations from raw source code, it prevents sensitive information leakages and guarantees application flexibility across staging, testing, and production states.

const apiUrl = process.env.REACT_APP_API_URL;


You can download the jar file (preserve the .jar extension), and then it can be run as an application like "java -jar AbacusApp.jar -rails=15" or "java -jar AbacusApp.jar -lee=1 -leftAuxRails=9 -rightAuxRails=9". The X Manual Page is written for the X version but may be useful to understanding the Java program.

Java Abacus Abacus Implementation for Java
Icon Source Code Jar File
abacus.zip AbacusApp.jar

There is a feature for teachers to test students on the use the abacus. This would give the ability to create your own tests. Results would go into a results directory. Sample tests are given in zip file (there is only the one test so far). The idea is to move the beads to the correct position and then record the answer by a certain time.

See project notes for todo list and history.

X Abacus (and Windows too)

Still my favorite Abacus Abacus Implementation for X (Linux and friends) and Windows
Icon Latest Source Latest Windows Man Page README LSM Older Versions Ancient Versions
xabacus-latest.tar.xz wabacus-latest.zip xabacus xabacus.README xabacus.lsm At SillyCycle At Ibiblio

NewA Transparent Abacus
Cat behind Abacus


Latest UNIX/VMS version is 8.9.3 and was written in C/C++. Windows version has same source and compiled with MinGW (though does have less features).

See project notes for todo list and history.

Notes

Learning the Abacus
ABACUS Guide Book
HOW TO LEARN LEE'S ABACUS
Books by Takashi Kojima
The Japanese Abacus, Its Use and Theory
Advanced Abacus Japanese Theory and Practice
The Abacus
Salamis Tablet
TOMOE Soroban
Short story by Isaac Asimov The Feeling of Power
Rhymes with Orange Cartoon 2011-08-22 (on 12th page)

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Last Revised: 2 March 2026