Created
July 4, 2018 13:33
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Nim Karax Elm Architecture Example
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include karax / prelude | |
import strutils | |
type | |
Model = object | |
counter*: int | |
Dispatch = proc(model: Model): void | |
proc init(): Model = | |
result = Model(counter: 0) | |
proc up(model: Model, amount: int): Model = | |
result = model | |
result.counter = model.counter + amount | |
proc down(model: Model, amount: int): Model = | |
result = model | |
result.counter = model.counter - amount | |
proc view(model: Model, dispatch: Dispatch): VNode = | |
result = buildHtml(tdiv): | |
button: | |
text "Up 2" | |
proc onclick() = | |
dispatch(model.up(2)) | |
button: | |
text "Down 1" | |
proc onclick() = | |
dispatch(model.down(1)) | |
tdiv: | |
text "count" | |
tdiv: | |
text $model.counter | |
proc runMain() = | |
var model: Model = init() | |
proc dispatch(m: Model): void = | |
model = m | |
proc renderer(): VNode = | |
result = view(model, dispatch) | |
setRenderer renderer | |
runMain() |
Interesting. But this only allows the state to be either 2 or -1. I had to change the model to
type Model = ref object counter*: int
To get a persistent state.
In case of Model = ref object
, change the two "funcs" to:
proc up(m: Model, amount: Natural): Model =
result = Model(counter: m.counter + amount)
proc down(m: Model, amount: Natural): Model =
result = Model(counter: m.counter - amount)
...and it wont work, which means this example isn't working correctly (at least as I understand it), there always one instance of Model
and is passed around.
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Hi! How do you split that into components?