Is there a shorter way to define an object structure with variable keys?

var adddata = {};
adddata[ group ] = {};
adddata[ group ].type = type;
adddata[ group ].items = {};
adddata[ group ].items[ id ] = value;
$.extend( data, adddata );

Do i really need to define adddata this long way? If group and id are fixed strings, it's pretty short

$.extend( data, { group1:{ type: t开发者_如何转开发ype, items:{ id1: value } } } );

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Javascript only supports literal keys within object literals. You can only make the code a little shorter:

var adddata = {};
adddata[group] = { type: type, items: {} };
adddata[group].items[id] = value;
$.extend(data, adddata);