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Promises chaining#189

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Merged
vplentinax merged 9 commits intojavascript-tutorial:masterfromcortizg:es.javascript.info.1-11-03-pc
Jun 10, 2020
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@@ -1,20 +1,22 @@
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:
La respuesta corta es: **no, no son iguales**:

La diferencia es que si ocurre un error en `f1`, entonces aqui es manejado por `.catch`:

```js run
promise
.then(f1)
.catch(f2);
```

...But not here:
...Pero no aquí:

```js run
promise
.then(f1, f2);
```

That's because an error is passed down the chain, and in the second code piece there's no chain below `f1`.
Esto se debe a que se pasa un error por la cadena y en la segunda pieza del código no hay una cadena debajo de `f1`.

En otras palabras, `.then` pasa los resultados/errores al siguiente `.then/catch`. Entonces, en el primer ejemplo, hay un `catch` debajo, y en el segundo no lo hay, por lo que el error no se maneja.

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.
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#Promise: then versus catch
#Promesa: then versus catch

Are these code fragments equal? In other words, do they behave the same way in any circumstances, for any handler functions?
¿Son iguales estos fragmentos de código? En otras palabras, ¿se comportan de la misma manera en cualquier circunstancia, para cualquier función de controlador?

```js
promise.then(f1).catch(f2);
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