nim-lang/Nim

Nim is a compiled, garbage-collected systems programming language which has an excellent productivity/performance ratio. Nim's design focuses on efficiency, expressiveness, elegance (in the order of priority).

Kaushal Modi

@kaushalmodi

and also [] and lc?

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@FromIRC

<Yardanico> well, docs explain them pretty much

<Yardanico> lc is for list comprehension (like in python), but you need to specify types

<Yardanico> and there are examples for -> and =>

<Yardanico> (for lc too)

Kaushal Modi

@kaushalmodi

I cannot grasp the example in https://nim-lang.org/docs/future.html#=%3E.m,untyped,untyped

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@FromIRC

<Yardanico> why?

Kaushal Modi

@kaushalmodi

What's the relationship between -> and f in that example?

And how does that link with the use of => in the next line?

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@FromIRC

<Yardanico> well, this example just uses -> and => at the same time

<Yardanico> -> is for proc types, => is for lambdas

<Yardanico> line with => is the same as "echo passTwoAndTwo(proc (x, y: int): int = x + y)"

<Yardanico> and proc passTwoAndTwo(f: (int, int) -> int): int = is the same as proc passTwoAndTwo(f: proc (x, y: int): int): int =

<miran> regarding lc - the current syntax is IMO clumsy, so while i prefer list comprehensions in python, i use map in nim

Kaushal Modi

@kaushalmodi

Yardanico: Thanks. It's still not clear.. But let me play around with those for a bit. I'll get back if I have questions

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@FromIRC

<Yardanico> miran, maybe use mapIt instead?

<miran> @Yardanico: yeah, mapIt is nice, i'm using it also

<Yardanico> and if you do a lot of mapIt filterIt etc and need performance you would use zero_functional module

<miran> @Yardanico: i use that too :⁠) very nice library!!

<miran> @kaushalmodi: start with =>

Govind KP

@reisub0

Hello and I'm sorry if my question is missing something very basic but, I seem to have encountered another issue

Trying to compile my very basic function

proc delayedStringGet(path: string) : Future[string] {.async.} =
    var response = await client.request(url=(Host & path), body=body)
    return response.body

Gives me this compile-time error. I seem to be matching the prototypes pretty accurately, so can't figure out what I'm doing wrong

proc request(client: AsyncHttpClient; url: string; httpMethod: string; body = "";
            headers: HttpHeaders = nil): Future[AsyncResponse]
  first type mismatch at position: 1
  required type: AsyncHttpClient
  but expression 'client' is of type: AsyncHttpClient
proc request(client: AsyncHttpClient; url: string; httpMethod = HttpGET; body = "";
            headers: HttpHeaders = nil): Future[AsyncResponse]
  first type mismatch at position: 1
  required type: AsyncHttpClient
  but expression 'client' is of type: AsyncHttpClient

From IRC (bridge bot)

@FromIRC

<miran> the problem with the example in the docs is that it unnecessary uses both -> and => at the same time

Kaushal Modi

@kaushalmodi

I am trying to convert this in emacs lisp to =>:

(let ((plus1 (lambda (x)
                (+ x 1))))
  (funcall plus1 1)) ; returns 2

Danil Yarantsev

@Yardanico

@reisub0 did you forget to create "body" variable?

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@FromIRC

<miran> @kaushalmodi this is the simplest example of => i could make from the top of my head: http://ix.io/1fSS/

Govind KP

@reisub0

No it's been created with let body="type=task"

Andreas Rumpf

@Araq

use import, not include

AsyncHttpClient is probably some other type you introduced on your own

Govind KP

@reisub0

I am using import

Kaushal Modi

@kaushalmodi

miran: Thanks!

Govind KP

@reisub0

And this code is only literally one file

Danil Yarantsev

@Yardanico

@rtei

@reisub0 can you post full code on gist if you can?

also what is your nim version?

with this code I get another error (which is because .body from asyncresponse is a future and you need to "await" for it)

import httpclient, asyncdispatch

let client = newAsyncHttpClient()
let Host = "123"
let body = "123123"

proc delayedStringGet(path: string) : Future[string] {.async.} =
    var response = await client.request(url=(Host & path), body=body)
    return response.body

@Araq btw, with code:

import httpclient, asyncdispatch

let client = newAsyncHttpClient()
let Host = "123"

proc delayedStringGet(path: string) : Future[string] {.async.} =
    var response = await client.request(url=(Host & path), body=body)
    return response.body

I get error:

tta.nim(7, 32) Error: type mismatch: got <AsyncHttpClient, url: string, body: None>
but expected one of:
proc request(url: string; httpMethod = HttpGET; extraHeaders = ""; body = "";
            sslContext = getDefaultSSL(); timeout = -1; userAgent = defUserAgent;
            proxy: Proxy = nil): Response
  first type mismatch at position: 1
  required type: string
  but expression 'client' is of type: AsyncHttpClient
proc request(client: AsyncHttpClient; url: string; httpMethod: string; body = "";
            headers: HttpHeaders = nil): Future[AsyncResponse]
  first type mismatch at position: 1
  required type: AsyncHttpClient
...etc

Is this normal? "body: None"

Kaushal Modi

@kaushalmodi

hmm.. future is renamed to sugar on devel?

Danil Yarantsev

@Yardanico

yes it is

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@FromIRC

<miran> yup

Andreas Rumpf

@Araq

<AsyncHttpClient, url: string, body: None> is the problem

plus some wrong compiler error message :-)

Govind KP

@reisub0

Are these optional parameters or are they all compulsory?

I did manage to get it to compile on this gist

https://gist.github.com/5bc3c481ecf5468064ec171e95f46d6b

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@FromIRC

<Yardanico> @reisub0 if a proc has argument like "someName = someValue" then it's optional

<shashlick> @Araq: just posted about tissue on the forum - https://forum.nim-lang.org/t/4008

Govind KP

@reisub0

@Yardanico Well, that doesn't make any sense because, then, it should have matched the proc prototype?

Kaushal Modi

@kaushalmodi

this obviously doesn't work:

import sugar
echo 1.(x => x + 1)

what's the correct syntax?

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@FromIRC

<miran> you're missing map

<miran> oops, no

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