The same argument also implies that arrays are more powerful than scalar 
values, and we should e.g. never use a number when we could instead just use a 
single-element array with a number.

From: es-discuss [mailto:es-discuss-boun...@mozilla.org] On Behalf Of Boopathi 
Rajaa
Sent: Saturday, March 28, 2015 08:15
To: es-discuss@mozilla.org
Subject: Promises vs Streams

I feel this must have already been discussed but couldn't find any discussion 
threads, just trying to understand them better.

The basic doubt is that I feel promises are more like streams, and that streams 
are much more powerful than promises. With a promise you have a value or an 
exception, and with a stream, you have a list of values or an exception.

Why do we have both ? or more specifically, since we have both, when to use 
Promises and when to use Streams ? Whatever I imagine to be a Promise can be 
thought out to be solved by Streams, and sometimes whenever I use streams, it 
feels like I'm using similar API as Promises.

- Boopathi
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