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showerror

showerror(io, e)

Show a descriptive representation of an exception object.

Examples

In the Julia programming language, the function showerror(io, e) is used to display a descriptive representation of an exception object.

1. Display exception information:

   julia> try
             error("Oops! Something went wrong.")
         catch err
             showerror(stdout, err)
         end
   ERROR: Oops! Something went wrong.
   Stacktrace:
   [1] error(s::String)
     @ Base ./error.jl:33
   [2] top-level scope
     @ REPL[1]:2

   This example shows how to use showerror to display the error message and stacktrace of an exception object. The stdout argument specifies that the output should be printed to the standard output.

2. Capture exception information to a string:

   julia> try
             error("Oops! Something went wrong.")
         catch err
             str = IOBuffer()
             showerror(str, err)
             message = String(take!(str))
         end
   "ERROR: Oops! Something went wrong.\nStacktrace:\n [1] error(s::String)\n   @ Base ./error.jl:33\n [2] top-level scope\n   @ REPL[1]:2\n"

   This example demonstrates how to capture the exception information to a string. By using an IOBuffer, the output of showerror is stored in the buffer, which can then be converted to a string.

Common mistake example:

julia> try
           error("Oops! Something went wrong.")
       catch err
           showerror(err)
       end
ERROR: MethodError: no method matching showerror(::ErrorException)
Closest candidates are:
  showerror(::IO, ::Any) at errorshow.jl:47
Stacktrace:
 [1] top-level scope
   @ REPL[1]:5

In this example, showerror is called without specifying the IO argument. It is essential to provide an IO object as the first argument to showerror to indicate where the error message should be displayed.

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