jdjkelly/reduxir.md

## reduxir.md

      
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              reduxir.md
            
          
    Elixir-flavored Redux:
defmodule Store do
 def start_link(reducer, preloadedState) do
   Agent.start_link(fn -> { reducer, preloadedState } end)
 end

 def start_link(reducer) do
   Agent.start_link(fn -> { reducer, nil } end)
 end

 def dispatch(store, action) do
   { reducer, state } = Agent.get(store, fn(store) -> store end)
   Agent.cast(store, fn(_) -> { reducer, reducer.(state, action) } end)
 end

 def get_state(store) do
   Agent.get(store, fn({ reducer, state }) -> state end)
 end
end

example:
iex(41)> counter = fn
...(41)>   (state, { 'INCREMENT', _ }) -> state + 1
...(41)>   (state, { 'DECREMENT', _ }) -> state - 1
...(41)>   (state, _) -> state
...(41)> end
#Function<12.118419387/2 in :erl_eval.expr/5>
iex(42)>
nil
iex(43)> {:ok, store} = Store.start_link(counter, 0)
{:ok, #PID<0.257.0>}
iex(44)>
nil
iex(45)> Store.dispatch(store, { 'INCREMENT', nil })
:ok
iex(46)>
nil
iex(47)> Store.get_state(store)
1

pattern-matching functions 👍
counter = fn
 (state, { 'INCREMENT', _ }) -> state ++
 (state, { 'DECREMENT', _ }) -> state --
 (state, _) -> state
end```