Elixir 變量域

ex> try do
...>   raise "fail"
...>   what_happened = :did_not_raise
...> rescue
...>   _ -> what_happened = :rescued
...> end
iex> what_happened
** (RuntimeError) undefined function: what_happened/0

作為替代,你可以存儲(chǔ)?try?表達(dá)式的值:

iex> what_happened =
...>   try do
...>     raise "fail"
...>     :did_not_raise
...>   rescue
...>     _ -> :rescued
...>   end
iex> what_happened
:rescued

對try,catch和rescue的介紹到此結(jié)束.你會(huì)發(fā)現(xiàn)相較于其他語言,在Elixir中較少用到它們,盡管在某些庫或特定的代碼沒有"按照規(guī)則"書寫時(shí),它們很有用.