[elm-discuss] Re: Unit Types : A Radical Proposal

[Job van der Zwan]

On Thursday, 28 July 2016 20:42:44 UTC+2, John Bugner wrote:
>
> (5) Perhaps compound unit types like "Time^2" would be supported, so a 
> "Time * Time" would yield "Time^2", "Time * Float" would yield "Time", and 
> "Time * Length" would yield just that: "Time * Length". ("Force" would be 
> an alias of "Mass * Length / (Second^2)".)
>

Here's how Julia handles this, although it seems to require hand-coding all 
of of the promotion rules:

http://docs.julialang.org/en/release-0.4/devdocs/promote-op/

(understanding this may require a bit of understanding Julia's type system, 
which lets you define your own types down to the bit-level 
, complete with custom 
conversion and promotion rules 
)

Not sure how that might translate to Elm's type system, but I guess using 
custom infix operators will be part of it (except for not allowing 
redefining the built-in ones). Off-topic, but is this really all 
documentation available on infix operators? Because I don't really think 
that's good enough:

http://elm-lang.org/docs/syntax#infix-operators 

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[elm-discuss] Re: Collecting use cases for File, ArrayBuffer and TypedArrays/DataViews

[Job van der Zwan]

On Thursday, 28 July 2016 23:17:51 UTC+2, Daniel Bachler wrote:
>
> *TypedArrays and DataViews*
> Please add your own ideas to this thread. Once we have compiled a list of 
> use cases, we can look at the JS Apis available under the Web Platform for 
> Files, ArrayBuffers, Typed Arrays etc. and think how these could be exposed 
> to Elm. 
>

Hi, I'm not using Elm yet but thinking about it because I'm bitten by 
undefined variables way to often currently and miss my statically typed 
languages. 

I'm developing for a research group to build a data browser for their 
growing RNA database. Basically, we'll be dealing thousands of cells with a 
arrays of thousands of genes each, and for each gene have an integer value 
representing how much RNA activation was measured, plus a bunch of metadata 
per cell. This data itself is immutable of course, but the plan is to 
on-the-fly render the datavisualisations (with as little rendering as 
possible - we'll probably use  for this).

So a compact way of storing and a fast way of accessing these gene values 
is important. TypedArrays would probably help here.

(also, suggestions on how to best use the canvas element in Elm are 
welcome, since elm-graphics appears more-or-less deprecated, but maybe I 
should open a separate topic for that?)

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