I think you want to do something like:
{ model | -- update the record properties -- }
|> update SecondThing
|> update ThirdThing
|> update FourthThing
On Friday, 2 December 2016 17:56:37 UTC+1, Rex van der Spuy wrote:
Hi Everyone,
>
> Usually when I want a series of updates to chain in sequence, I'll write
> some code like this:
>
> FirstThing ->
> let
> newModel = { model | -- update the record properties -- }
> in
> update SecondThing newModel
>
> SecondThing ->
> let
> newModel = { model | -- update the record properties -- }
> in
> update ThirdThing newModel
>
> ThirdThing ->
> let
> newModel = { model | -- update the record properties -- }
> in
> update LastThing newModel
>
> LastThing ->
> let
> newModel = { model | -- update the record properties -- }
> in
> newModel ! [ ]
>
>
> But... isn't this similar to using a GOTO statement in BASIC?
> (Hey, I love BASIC, but... !)
> I've found that when I have a few of these chained in sequence, spaghetti
> code is the guaranteed result.
>
> Is there someway to manage this sequencing in some kind of centralized way?
> For example, something like:
>
> SequenceOfSteps ->
> FirstThing
> SecondThing
> ThirdThing
> LastThing
>
> It would be nice to do this so that I can selectively insert or remove
> steps while testing my application.
>
> Is this possible?
> Any advice or opinions?
>
>
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