Fetch URL Challenge

The challenge: Implement a function that fetches a list of URLs concurrently respecting the API limitations.

Guide

Step 1: Setup

This interview uses a locally-running server running on localhost:3000 that your solution code will communicate with. To start it, in a separate terminal type:

cd typescript
npm install
npm run server          # keep running in a terminal

Open another terminal window in this folder that you can use to test your solution later.

For Python, open up python/solution.py

For Typescript, open up typescript/solution.py

How to Run Your Solution

First, make sure your server from above is running in another terminal window. Second, in a new terminal window, use the following commands

TypeScript

cd typescript
npx tsx run.ts                              # default: ./solution.ts
npx tsx run.ts path/to/solution.ts          # or specify a file

Python

cd python
uv run run.py                               # default: ./solution.py
uv run run.py path/to/solution.py           # or specify a file

Use run to iterate on your solution — it prints each result so you can see what's happening. Use the test harness when you're ready to validate.

If you need to log to stdout, the typical ways will work: Typescript

console.log("foo")

Python

print("bar")