linq js groupby

var list=[
  {id:1,name:"lily",gender:0,o:{id:123}},
  {id:2,name:"lucy",gender:0,o:{id:456}},
  {id:3,name:"lilei",gender:1,o:{id:123}},
  {id:4,name:"hanmeimei",gender:0,o:{id:789}}                            
];

enumerable.from(list).groupby(x=>x.o.id).select(x=>({key:x.key(),source:x.getsource()})).toarray();