[Solved] Returning multiple values?

Sophia Smart Contract Development
1

Is it possible in Sophia for a function to return multiple values, something like: return (a, b) in Solidity?

2

Sophia is a functional language and each function returns the result of the last statement, so yes you can “return” a tuple in Sophia:

  entrypoint foo(a : string, b : string) : string * string =
    (a, b)

would be a function that takes two arguments (strings in this case) and return a pair of strings.

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3

thanks! could you give just a short example of how a calling function would work with that tuple? I can’t find in the documentation even how we get an element of a tuple…is it tuple[index] or tuple(index)…?

4

let (a, b) = t

There is also standard library functions to work with Pair’s and Triple’s

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5

Yeah, if you include Pair.aes you should have access to Pair.fst and Pair.snd functions. But the pattern matching in let should be a nicer option

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6

@hanssv.chain @philipp.chain actually let (a, b) = t compiles in IDE, like fireeditor, but when using remote compiler directly from js i get: Error: Http request for https://compiler.aepps.com/aci failed with status code 400. Status: Bad Request.
Error data: [{“message”:"Unexpected token ‘(’
Any ideas?

7

Trying https://compiler.aepps.com/version will reveal the problem I think… Ancient stuff.

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8

Ok, is there something more up to date? Why is the official remote compiler not up to date anyway?

9

IDE compiler (any idea what version is used there) and the official remote compiler are not the same version, I tried before syncing full node of course, but that took weeks and then got stuck at some point, there are no bootstrap files to speed up sync as far as i am aware of…I think it is really important for AE to make it easy for devs to dev aepps

10

who is in charge of maintaining https://compiler.aepps.com/

11

I think the latest compiler is at https://latest.compiler.aepps.com

The compiler development and info is at GitHub - aeternity/aesophia: Stand alone compiler for the Sophia smart contract language and if you are interested in the HTTP-compiler in particular it is at GitHub - aeternity/aesophia_http

docker pull aeternity/aesophia_http && docker run -p 3080:3080 aeternity/aesophia_http

give you the latest compiler locally.

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12

thanks, latest.compiler (4.3) works :slight_smile:
regarding the docker command, that works without sync? i assume aesophia_http connects to a remote full node, and then local compiler can work without waiting for sync?

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13

The compiler is separate from the node since a year and a half… Nothing to sync, I timed the command above it took 13 seconds to setup (on a fast internet)…

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