How to catch errors with ea¶

$::error::ea (Execute Alternate) tries an expression and falls back to an alternative if it fails. Both arguments are character vectors containing APL expressions:

      #import $::error::ea
      '0' ea '2+3'
5

      '0' ea '1÷0'
0

The right argument is evaluated first. If it succeeds, its result is returned. If it raises an error, the left argument is evaluated instead.

Return the error code on failure¶

      'en 0' ea '1÷0'
3

Here en 0 returns the error number of the most recent error (DOMAIN ERROR = 3).