XPages: Bug in fromJson (with fix)

Update 07.10.10: I added a by-value copy method

toJson can convert most JavaScript objects to JSON. fromJson can not convert back all JSON strings that toJson creates.

Example:

var arrayJson = toJson( [1,2,3] ); // "[1,2,3]"
fromJson( arrayJson ) // fails

If you try the same in Firefox, which has implemented the JSON API, everything works:

var arrayJson = JSON.stringify( [1,2,3] ); // "[1,2,3]"
JSON.parse( arrayJson ) // [1,2,3]

I've created a simple wrapper-class that works around this bug:

var JSON = {
 // Makes a by-value copy of the object
 copy: function( object ){
  try {
   // Faster way to copy arrays
   if( object && typeof object.concat === 'function' ){ return object.concat(); }
   
   return this.parse( this.stringify( object ) );
  } catch( e ){ /*Debug.logException( e );*/ }
 },

 // Converts object to JSON string
 stringify: function( object ){
  try {
   return toJson( object );
  } catch( e ){ /*Debug.exception( e );*/ }
 },

 // Parses JSON to JS object
 parse: function( JSON ){
  try {
   return fromJson( '{"values":' + JSON + '}' ).values;   
  } catch( e ){ /*Debug.exception( e );*/ }  
 }
}

It saddens me that there are so many "simple" bugs in the XPages API. :\

Share and enjoy!