The Janet Language

Re:The Janet Language by mst on Saturday February 18, 2023 @07:12AM (#34846306)

It's notable that raku (previously known as perl6) lets you write things in either direction, if I remember correctly something like

  @source >>> map { ... } >>> grep { ... } >>> my @sink;

though note I'm typing from memory on my second coffee so I may have got that slightly wrong.

Plus of course there's many languages with a |> operator so you can do

  g(x) |> f

I also (the example is specialised for I/O but the implementation technique could trivially be borrowed for something that wasn't) implemented something sort of in this direction for perl once: http://p3rl.org/IO::Pipeline

I'm not convinced that left-to-right is -always- the best option and prefer having the choice of both, but I wouldn't be at all surprised if a survey of developers found that if they could only pick one they'd pick left-to-right, and while I'd find it hard to choose for myself alone I'd probably pick left-to-right on the basis that it'd likely make it easier to onboard people to any given codebase.

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Re:The Janet Language by tmtvl on Saturday February 18, 2023 @11:08AM (#34847927)

Raku also has map and grep methods for collections, so it could be written as...

  my @sink = @source.map({...}).grep({...}).sort;

Which also makes multithreading the operation easy:

  my @sink = @source.hyper.map({...}).grep({...}).sort.list;

That said, I think the operator you're looking for is the feed operator, ==>:

  my @sink;
  @source ==> map {...} ==> grep {...} ==> sort ==> @sink;

It also has the corresponding reverse, <==, because why not. The docs* mention that ==> may at some point do automatic parallelization, but I don't know what the status of that feature is.

* https://docs.raku.org/routine/==%3E

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Re:The Janet Language by mst on Sunday February 19, 2023 @08:41AM (#34857472)

> That said, I think the operator you're looking for is the feed operator, ==>

Yes, yes it was.

Clarifications and elaborations much appreciated.

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