rebcabin

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

So you're curious in learning this new thing called (Functional) Reactive Programming (FRP).

Learning it is hard, even harder by the lack of good material. When I started, I tried looking for tutorials. I found only a handful of practical guides, but they just scratched the surface and never tackled the challenge of building the whole architecture around it. Library documentations often don't help when you're trying to understand some function. I mean, honestly, look at this:

Rx.Observable.prototype.flatMapLatest(selector, [thisArg])

Projects each element of an observable sequence into a new sequence of observable sequences by incorporating the element's index and then transforms an observable sequence of observable sequences into an observable sequence producing values only from the most recent observable sequence.

rebcabin

Org-mode Org-mode Reference Card

Org mode reference card

Created from the plain text reference card on orgmode.org Download this file, and open it in Emacs org-mode!

rebcabin

ClearAll[generateWithTime, createObserver, observer, observable, 
  disposable, task];
generateWithTime[
   initialState_,
   condition_,
   resultSelector_,
   timeSelector_,
   iterate_] :=
  Module[{
    state = initialState,

rebcabin

ClearAll[generateWithTime];
generateWithTime[
  initialState_,
  condition_,
  resultSelector_,
  timeSelector_,
  iterate_] :=
 Module[{
   state = initialState,
   lastTaskForCleanup,

rebcabin

(*
Cold GenerateWithTime

Rx.Observable.GenerateWithTime = function(
  initialState,   // : State
  condition,      // : State -> bool
  resultSelector, // : State -> Result
  timeSelector,   // : State -> int
  iterate)        // : State -> State

rebcabin

SetAttributes[gridCaptive2, HoldAllComplete];

dpyCaptive2[{ex_, {}}]      := dpyNullary[dpyCaptive2 @ ex];
dpyCaptive2[{a_, {as__}}]   := dpyMultiary[dpyCaptive2 @ a, dpyCaptive2 /@ {as}];
dpyCaptive2[number2[ex_]]   := dpyQuotedAtom[number2[ex]];
dpyCaptive2[string2[ex_]]   := dpyQuotedAtom[string2[ex]];
dpyCaptive2[symbol2[ex_]]   := dpyQuotedAtom[symbol2[ex]];
dpyCaptive2[x___]           := Throw[Unevaluated @ {x}];

gridCaptive2[expr_] := dpyCaptive2 @ captive2 @ expr;

rebcabin

SetAttributes[captive2, HoldAllComplete];
captive2[expr_ /; NumberQ @ Unevaluated @ expr]           := number2[ToString[expr]]
captive2[expr_ /; (Head @ Unevaluated @ expr === Symbol)] := symbol2[ToString @ Unevaluated @ expr]
captive2[expr_ /; (Head @ Unevaluated @ expr === String)] := string2["\"" <> expr <> "\""]
captive2[head_[args___]] := {captive2 @ head, captive2 /@ Unevaluated @ {args}}
captive2[x___] := Throw @ {x};

rebcabin

ClearAll[P, Wff, Proposition, Unary, Binary, T, 
  nonTerminalsFromGrammar, terminalsFromGrammar];

P[Wff] = {{Proposition}, {Unary}, {Binary}};
P[Proposition] = {{"p"}, {"q"}, {"r"}, {"s"}};
P[Unary] = {{"N", Wff}};
P[Binary] = {{"C", Wff, Wff}, {"A", Wff, Wff}, {"K", Wff, Wff}, {"E", 
    Wff, Wff}};
P[Start] = P[Wff];
ClearAll[nonTerminalsFromGrammar];

rebcabin

gridRules[rules_] /; 
	(ListQ[rules] && 
	(Length @ rules > 0) && 
	(And @@ (((Head @ # === Rule)||(Head @ # === RuleDelayed))& /@ rules))) :=
  With[{
    keys = #[[1]]& /@ rules,
    heads = #[[0]]& /@ rules,
    vals = gridRules[#[[2]]]& /@ rules},
   Grid[MapThread[{
	    Style[#1, Bold],

rebcabin

(* This code is released into the public domain by its author, Brian \
Beckman, on 2 Aug 2012. *)

ClearAll[grid, fopts];
ClearAll[allAreRulesQ, noneAreAtomsQ];
(* A "HoldAll" version of the following, with "Unevaluated" \
everywhere, may be required. *)
noneAreAtomsQ[candidates_List] := 
  And @@ (Not[AtomQ@#] & /@ candidates);
allAreRulesQ[candidates_List] :=