Properties defined multiple times

[cecilemuller]

A question from the X3D mailing-list referencing #1 :

Something that jumps out is when you say "How would you make a Group that contains a Shape, a Transform and another Shape ? It can't be the following because an Object can't define property Shape twice".

That is indeed a serious constraint, if it is indeed correct - that wasn't clear about Javascript. (got a reference?)

[cecilemuller]

Consider this Javascript code:

var myobj = JSON.parse('{"value": 1, "value": 2, "value": 3}');

Values 1 and 2 are lost, only 3 remains (in all web browsers and even Node & Io.js).
Same thing with PHP, only 3 remains:

$myobj = json_decode('{"value": 1, "value": 2, "value": 3}');

Therefore if something needs multiple values, use an Array, do not duplicate keys.

[coderextreme]

How was this closed?

[cecilemuller]

Oh sorry I didn't see your comment until now.

It was closed because using duplicated keys in objects is not an option (otherwise it would be up to debate), it's a technical constraint to be compatible with native parsers like Javascript's JSON.parse.