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knewter/why.ex

Created May 21, 2014 02:46
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why.ex
iex(1)> increment = &Map.update!(&1, :count, fn(x) -> x + 1 end)
#Function<6.106461118/1 in :erl_eval.expr/5>
iex(2)> increment = fn(x) -> x[:count] = x[:count] + 1 end
** (ArgumentError) dynamic access cannot be invoked inside match and guard clauses
(elixir) expanding macro: Kernel.access/2
(elixir) iex:2: :elixir_compiler.__FILE__/2
iex(2)>
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