Web3 · hard

49. Transaction Lifecycle

Track valid transitions: PENDING -> SUCCESS/FAILED.

Write `transition(current, next)` returning next if valid, else current.

Required in your answer: allowed[c].includes

Runs in a sandboxed worker

function transition(c, n) {
  const allowed = { PENDING: ['SUCCESS', 'FAILED'], SUCCESS: [], FAILED: [] };
  return allowed[c].includes(n) ? n : c;
}

Output appears here.