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Showing content from https://webplatform.github.io/docs/javascript/Error/description below:

description · WebPlatform Docs

description Summary

Returns or sets the descriptive string associated with a specific error.

Syntax

object .description  [ =  stringExpression ]

object: Required. Any instance of an Error object.
stringExpression: Optional. A string expression containing a description of the error.

Examples

The following example illustrates the use of the description property.

try
 {
 
     x = y
 }
 catch(e)
 {
 
     document.write(e)
     document.write (" ");
 
     document.write((e.number & 0xFFFF))
     document.write (" ");
 
     document.write(e.description);
     document.write (" ");
 
     document.write(e.message)
 }

Remarks

The description property contains the error message string associated with a specific error. Use the value contained in this property to alert a user to an error.

The description and message properties provide the same functionality; the description property provides backward compatibility; the message property complies with the ECMA standard.