Handle runtime errors — handle

Evaluates the given expression and then runs the on_success, on_error, or on_warning expressions depending on the result of the initial evaluation.

Usage

handle_error(
  expr,
  on_success = {
 },
  on_error = {
 },
  on_warning = {
 },
  finally = {
 }
)

Arguments

expr: Expression to evaluate
on_success: Expression to evaluate if expr succeeds
on_error: Expression to evaluate if expr generates an error
on_warning: Expression to evaluate if expr generates a warning
finally: Expression to evaluate after expr and on_success or on_error or on_warning, usually used for cleanup.

Value

Invisible result of expr if it succeeds, otherwise the error or warning object.