try for core

Try to run a block, if it fails optionally run a catch closure.

Signature

> try {flags} (try_block) (catch) (finally)

Parameters

  • try_block: Block to run.
  • catch: Closure to run if try block fails.
  • finally: Closure to run anyway.

Input/output types:

inputoutput
anyany

Examples

Try to run a division by zero.

> try { 1 / 0 }

Try to run a division by zero and return a string instead.

> try { 1 / 0 } catch { 'divided by zero' }
divided by zero

Try to run a division by zero and report the message.

> try { 1 / 0 } catch { |err| $err.msg }

Try to run a division by zero, report the message, and run finally

> try { 1 / 0 } catch { |err| print $err.msg } finally { 'clean' }

Notes

This command is a parser keyword. For details, check: https://www.nushell.sh/book/thinking_in_nu.html