Try/except statements

The try/except statement intercepts any exception raised by its protected statements.

Syntax

The simplest form of try/except stops all exceptions, no matter their types:

try
    statement-list
except
    statement-list
end

If you want to access the exception object, you can use a exception trap like this:

try
    statement-list
except on e: Exception do
    statement-list
end

If you want to trap exceptions according to their types, you can use one or several exception traps:

try
    statement-list
except on e: exception-type1 do
    statement-list1
except on e: exception-type2 do
    statement-list2
except on e: exception-type3 do
    statement-list3
except
    statement-list4
end

You can end a try/except statement with a finally clause:

try
    statement-list
except on e: exception-type1 do
    statement-list1
except on e: exception-type2 do
    statement-list2
except on e: exception-type3 do
    statement-list3
except
    statement-list4
finally
    statement-list5
end

This finally clause will always be executed, even if an exception is fired in any of the previous parts of the same statement. You can also use a finally clause without any previous except clauses.

See also

The Freya Programming Language
Statements
raise statements
try/finally statements
try/fault statements
using statements
Expressions