fetch-repos.js in JavaScript

Fetch a user's repos concurrently and rank them by stars.

#!/usr/bin/env node
// Fetch a user's public repos concurrently and print the busiest ones.

const API = "https://api.github.com";

async function getJson(url) {
  const response = await fetch(url, {
    headers: { Accept: "application/vnd.github+json" },
  });
  if (!response.ok) {
    throw new Error(`${url} -> ${response.status}`);
  }
  return response.json();
}

async function main() {
  const user = process.argv[2] ?? "torvalds";
  const repos = await getJson(`${API}/users/${user}/repos?per_page=10`);

  const detailed = await Promise.all(
    repos.map((repo) => getJson(`${API}/repos/${repo.full_name}`)),
  );

  const busiest = detailed
    .sort((a, b) => b.stargazers_count - a.stargazers_count)
    .slice(0, 5);

  console.log(`top repos for ${user}:`);
  for (const repo of busiest) {
    const stars = String(repo.stargazers_count).padStart(7);
    console.log(`${stars}  ${repo.name} (${repo.language ?? "n/a"})`);
  }
}

main().catch((error) => {
  console.error(error.message);
  process.exitCode = 1;
});

How it works

1. getJson wraps fetch with header and status checks.
2. Promise.all loads every repo's detail at once.
3. Sorting by stars prints the busiest five.

Keywords and builtins used here

• Promise
• String
• async
• await
• catch
• const
• for
• function
• if
• of
• return
• throw

The run, in numbers

Lines

38

Characters to type

972

Tokens

259

Three-star pace

110 tpm

At the three-star pace of 110 tokens a minute, this run takes about 141 seconds.

Type this snippet

Step 1 of 1 in Encore, step 19 of 19 in Promises & async.

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