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Merge pull request #187 from ErikSchierboom/react
Add react exercise
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"sgf-parsing", | ||
"transpose", | ||
"tree-building", | ||
"grep" | ||
"grep", | ||
"react" | ||
], | ||
"deprecated": [ | ||
"binary", | ||
|
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module React | ||
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[<AbstractClass>] | ||
type Cell() = | ||
abstract Value : int with get, set | ||
abstract Changed: IEvent<int> | ||
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type InputCell(initialValue: int) = | ||
inherit Cell() | ||
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let mutable value = initialValue | ||
let changed = new Event<int>() | ||
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override this.Changed = changed.Publish | ||
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override this.Value | ||
with get() = value | ||
and set(newValue : int) = | ||
if value <> newValue then | ||
value <- newValue | ||
changed.Trigger(newValue) | ||
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type ComputeCell(inputs: Cell list, compute: (int list -> int)) = | ||
inherit Cell() | ||
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let computeValue() = inputs |> List.map (fun x -> x.Value) |> compute | ||
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let mutable value = computeValue() | ||
let changed = new Event<int>() | ||
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let updateValue() = | ||
let newValue = computeValue() | ||
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if newValue <> value then | ||
value <- newValue | ||
changed.Trigger(newValue) | ||
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let subscribeToInputChanges() = | ||
[for input in inputs do | ||
input.Changed.Add(fun _ -> updateValue())] | ||
|> ignore | ||
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do | ||
subscribeToInputChanges() | ||
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override this.Changed = changed.Publish | ||
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override this.Value | ||
with get() = value | ||
and set(v : int) = failwith "Cannot directly set value of compute cell" | ||
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let mkInputCell value = new InputCell(value) | ||
let mkComputeCell (inputs: Cell list) (compute: (int list -> int)) = new ComputeCell(inputs, compute) | ||
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let setValue value (cell: Cell) = cell.Value <- value | ||
let value (cell: Cell) = cell.Value |
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module ReactTest | ||
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open NUnit.Framework | ||
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open React | ||
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[<Test>] | ||
let ``Setting the value of an input cell changes the observable value`` () = | ||
let i1 = mkInputCell 1 | ||
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Assert.That(value i1 , Is.EqualTo(1)) | ||
setValue 2 i1 |> ignore | ||
Assert.That(value i1 , Is.EqualTo(2)) | ||
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[<Test>] | ||
[<Ignore("Remove to run test")>] | ||
let ``The value of a compute is determined by the value of the dependencies`` () = | ||
let i1 = mkInputCell 1 | ||
let c1 = mkComputeCell [i1] (fun values -> values.[0] + 1) | ||
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Assert.That(c1.Value, Is.EqualTo(2)) | ||
setValue 2 i1 |> ignore | ||
Assert.That(c1.Value, Is.EqualTo(3)) | ||
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[<Test>] | ||
[<Ignore("Remove to run test")>] | ||
let ``Compute cells can depend on other compute cells`` () = | ||
let i1 = mkInputCell 1 | ||
let c1 = mkComputeCell [i1] (fun values -> values.[0] + 1) | ||
let c2 = mkComputeCell [i1] (fun values -> values.[0] - 1) | ||
let c3 = mkComputeCell [c1; c2] (fun values -> values.[0] * values.[1]) | ||
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Assert.That(c3.Value, Is.EqualTo(0)) | ||
setValue 3 i1 |> ignore | ||
Assert.That(c3.Value, Is.EqualTo(8)) | ||
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[<Test>] | ||
[<Ignore("Remove to run test")>] | ||
let ``Compute cells can have callbacks`` () = | ||
let i1 = mkInputCell 1 | ||
let c1 = mkComputeCell [i1] (fun values -> values.[0] + 1) | ||
let mutable observed = [] | ||
c1.Changed.Add(fun value -> observed <- observed @ [value]) |> ignore | ||
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Assert.That(observed, Is.EqualTo([])) | ||
setValue 2 i1 |> ignore | ||
Assert.That(observed, Is.EqualTo([3])) | ||
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[<Test>] | ||
[<Ignore("Remove to run test")>] | ||
let ``Callbacks only trigger on change`` () = | ||
let i1 = mkInputCell 1 | ||
let c1 = mkComputeCell [i1] (fun values -> if values.[0] > 2 then values.[0] + 1 else 2) | ||
let mutable observerCalled = 0 | ||
c1.Changed.Add(fun value -> observerCalled <- observerCalled + 1) |> ignore | ||
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setValue 1 i1 |> ignore | ||
Assert.That(observerCalled, Is.EqualTo(0)) | ||
setValue 2 i1 |> ignore | ||
Assert.That(observerCalled, Is.EqualTo(0)) | ||
setValue 3 i1 |> ignore | ||
Assert.That(observerCalled, Is.EqualTo(1)) | ||
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[<Test>] | ||
[<Ignore("Remove to run test")>] | ||
let ``Callbacks can be removed`` () = | ||
let i1 = mkInputCell 1 | ||
let c1 = mkComputeCell [i1] (fun values -> values.[0] + 1) | ||
let mutable observed1 = [] | ||
let mutable observed2 = [] | ||
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let changedHandler1 = Handler<int>(fun _ value -> observed1 <- observed1 @ [value]) | ||
c1.Changed.AddHandler changedHandler1 | ||
c1.Changed.Add(fun value -> observed2 <- observed2 @ [value]) |> ignore | ||
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setValue 2 i1 |> ignore | ||
Assert.That(observed1, Is.EqualTo([3])) | ||
Assert.That(observed2, Is.EqualTo([3])) | ||
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c1.Changed.RemoveHandler changedHandler1 | ||
setValue 3 i1 |> ignore | ||
Assert.That(observed1, Is.EqualTo([3])) | ||
Assert.That(observed2, Is.EqualTo([3; 4])) | ||
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[<Test>] | ||
[<Ignore("Remove to run test")>] | ||
let ``Callbacks should only be called once even if multiple dependencies have changed`` () = | ||
let i1 = mkInputCell 1 | ||
let c1 = mkComputeCell [i1] (fun values -> values.[0] + 1) | ||
let c2 = mkComputeCell [i1] (fun values -> values.[0] - 1) | ||
let c3 = mkComputeCell [c2] (fun values -> values.[0] - 1) | ||
let c4 = mkComputeCell [c1; c3] (fun values -> values.[0] * values.[1]) | ||
let mutable changed4 = 0 | ||
c1.Changed.Add(fun value -> changed4 <- changed4 + 1) |> ignore | ||
setValue 3 i1 |> ignore | ||
Assert.That(changed4, Is.EqualTo(1)) |