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Stop Writing Code Twice: Learn Polyglot Workflows

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πŸš€ 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.


🧠 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

πŸ› 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

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
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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 or pyyaml)
  • Bash (via jq, yq)
  • JavaScript (via JSON.parse)
  • Go (via encoding/json)

πŸ“¦ Your code doesn't need to be the same β€” just the interface.


4. Turn Scripts into APIs Automatically

Use tools like:

  • fastapi (Python)
  • func (Turns shell scripts into HTTP endpoints)
  • deno for TypeScript API servers

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:


πŸ“š 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:

  1. Write logic in Go
  2. Compile to .wasm using tinygo
  3. Wrap in language-specific interfaces:
  • Python: use wasmer
  • JS: import Wasm as module
  • Bash: call via CLI wrapper

πŸ” One logic, infinite uses.


πŸ”₯ 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

πŸ₯³ Emojis to Lighten the Mood

🀯 Writing code 3 times for 3 languages
😡 Forgetting how your Bash script worked
😀 Realizing your JS function has a bug that Python didn’t
πŸ§™β€β™‚οΈ Discovering Wasm + APIs solve everything
🧰 Building tools smarter, not harder
πŸš€ Shipping like a 10x engineer (even if you're solo)


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