Promises & then/catch

What value will be logged?

Promise.resolve(1)
  .then(x => x + 1)
  .then(x => Promise.resolve(x + 1))
  .then(x => { throw new Error('Failed'); })
  .catch(err => 0)
  .then(x => x + 1)
  .then(console.log);

1
2
3
1
This demonstrates Promise chain value transformation: 1) Initial value 1 is transformed to 2, then 3, 2) Error breaks the chain but catch() recovers with 0, 3) Chain continues with 0 + 1 = 1, 4) Shows how values flow through chains even after error recovery, 5) Illustrates both synchronous and asynchronous transformations, 6) Demonstrates how catch() can recover and continue the chain.

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