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The short answer is: **no, they are not the equal**: The short answer is: **no, they are not equal**:
The difference is that if an error happens in `f1`, then it is handled by `.catch` here: The difference is that if an error happens in `f1`, then it is handled by `.catch` here:
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That's because an error is passed down the chain, and in the second code piece there's no chain below `f1`. That's because an error is passed down the chain, and in the second code piece there's no chain below `f1`.
In other words, `.then` passes results/errors to the next `.then/catch`. So in the first example, there's a `catch` below, and in the second one -- there isn't, so the error is unhandled. In other words, `.then` passes results/errors to the next `.then/catch`. So in the first example, there's a `catch` below, and in the second one there isn't, so the error is unhandled.