@dancing-ninjas/project-euler-helper-kit/bin/euler-cli.js

Dancing Ninjas Project Euler helpers + constrained telemetry strategies compatible with npmjs.org-only egress.

#!/usr/bin/env node
import { isPrime, primesUpTo, nCrBig, fibonacciBig, sumDigits } from '../dist/index.js';

const args = process.argv.slice(2);
const cmd = args[0];

function hr(ms) {
  if (ms < 1000) return `${ms.toFixed(1)}ms`;
  const s = ms / 1000;
  if (s < 60) return `${s.toFixed(2)}s`;
  return `${(s / 60).toFixed(2)}m`;
}

async function main() {
  if (!cmd || cmd === 'help' || cmd === '--help') {
    console.log(`Euler CLI (Dancing Ninjas)
Usage:
  euler list                 # demo helpers
  euler prime <n>
  euler primesUpTo <n>
  euler fib <limit>
  euler nCr <n> <r>
  euler sumDigits <n>
`);
    return;
  }

  const t0 = performance.now();
  switch (cmd) {
    case 'list':
      console.log('Commands:', 'prime', 'primesUpTo', 'fib', 'nCr', 'sumDigits');
      break;
    case 'prime':
      console.log(isPrime(BigInt(args[1])));
      break;
    case 'primesUpTo':
      console.log(primesUpTo(Number(args[1])));
      break;
    case 'fib':
      console.log([...fibonacciBig({ limit: BigInt(args[1]) })]);
      break;
    case 'nCr':
      console.log(nCrBig(BigInt(args[1]), BigInt(args[2])).toString());
      break;
    case 'sumDigits':
      console.log(sumDigits(BigInt(args[1])));
      break;
    default:
      console.error('Unknown command');
  }
  console.log('Time:', hr(performance.now() - t0));
}

main().catch(err => { console.error(err); process.exit(1); });