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π Tired of Rewriting the Same Logic in Every Language?
If you're juggling between Python, JavaScript, Go, or even Bash in your projects, you've likely faced the pain of re-implementing the same logic in multiple languages β sometimes just to integrate a tool or automate a deployment.
This article teaches you how to build once, reuse anywhere using a combination of clever design, language-agnostic workflows, and tooling.
π§ Why You Should Care
- Stop wasting time converting between scripts
- Focus on core logic, not language syntax
- Create dev tools that scale across your whole stack
- Learn how real-world polyglot systems (like AWS, GitHub Actions, Docker) are designed under the hood
π οΈ Tools & Tactics
1. Use Wasm for Cross-Language Logic
WebAssembly (Wasm) isn't just for browsers anymore.
- Write your core logic in Rust or TinyGo
- Compile to
.wasm
-
Import that logic in:
- Python (
wasmer
,pyodide
) - JavaScript (native Wasm support)
- Node.js (via
@wasmer/wasi
) - Even shell scripts via CLI tools
- Python (
Resources:
2. Generate Code in Multiple Languages Automatically
Use Jinja2 templating to create boilerplate logic in multiple languages from one template.
Example:
A function spec like this:
name: calculate_tax
inputs:
- name: price
type: float
- name: tax_rate
type: float
Can auto-generate:
calculate_tax.py
calculate_tax.js
calculate_tax.go
Tools to try:
copier
- Custom CLI using
Click
+Jinja2
in Python
3. Use json
/yaml
as the Common Language
Design your functions to ingest JSON/YAML, and you can reuse them across:
- Python (via
json
orpyyaml
) - Bash (via
jq
,yq
) - JavaScript (via
JSON.parse
) - Go (via
encoding/json
)
π¦ Your code doesn't need to be the same β just the interface.
4. Turn Scripts into APIs Automatically
Use tools like:
Bundle your polyglot tools as local or cloud APIs. No need to rewire the logic for every language!
5. Bonus: Use nix
to Package Everything Cross-Platform
Tired of packaging pain? Use Nix to build language-agnostic environments for all your tools.
Learn more:
π Real-World Example: A Polyglot Calculator CLI
Goal: Write one tax calculator logic in Go, export to Wasm, and use it in Python + JS + Bash without re-writing.
Steps:
- Write logic in Go
- Compile to
.wasm
usingtinygo
- Wrap in language-specific interfaces:
- Python: use
wasmer
- JS: import Wasm as module
- Bash: call via CLI wrapper
π One logic, infinite uses.
π₯ TL;DR
Problem | Solution |
---|---|
Rewriting logic in every language | Write once β export via Wasm |
Packaging pain | Use Nix or containerize APIs |
Logic duplication | Template with Jinja2 |
Integration overhead | Wrap with FastAPI / func / Deno |
π₯³ Emojis to Lighten the Mood
π€― Writing code 3 times for 3 languages
π΅ Forgetting how your Bash script worked
π€ Realizing your JS function has a bug that Python didnβt
π§ββοΈ Discovering Wasm + APIs solve everything
π§° Building tools smarter, not harder
π Shipping like a 10x engineer (even if you're solo)
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