Note: As of Ela 0.15 exceptions are obsolete, please refer to "Errors" article for a new error handling strategy.
This article discusses exception handling in Ela.
Exceptions in Ela
Ela provides a support for so called resumable exceptions that can be raised using
fail statement and handled
Ela provides a support for structured exception handling in the same way as C-style language. A
is used to handle exceptions:
try 2 `div` 0 with
_ = 0
This expression has effectively the same syntax as
match expression and support pattern matching with multiple clauses is well.
If an expression, that follows
try keyword, doesn't fail,
try/with returns a value of this expression. If it fails, than an exception
is matched against patterns following
In order to generate exceptions one can use a
fail statement. It has the following syntax:
An example of using this statement:
fail "myfunc: Nil list!"