Javascript push with complex objects

Question

I'm building an array of objects which have a property of type array:

here's some simplified code:

var _data = [];
for(var i=0;i<10;i++) {
  var element = {
        id: i,
        answers: []
  };

  for(var j=0;j<3;j++) {                        
    var answer = {
      id: j,
      description: ''
    };
   element.answers.push(answer);
  }
  _data.push(element);
}

At the end of the two cicle the array _data has 10 elements but each element has the property answer empty (I expect 3 items for each element). Why this happens? It seems like the push doesn't push the entire object but only the "first level properties". thanks

Your code works for me, are you sure it isn't a display issue? Try checking the output of _data.toSource(). — user1107907
– user1107907, Commented Dec 21, 2011 at 14:56

fyr · Accepted Answer · 2011-12-21 14:56:56Z

Running your code in Firefox 8 results in the following _data array:

_data:

[{id:0, answers:[{id:0, description:""}, {id:1, description:""}, {id:2, description:""}]}, 
 {id:1, answers:[{id:0, description:""}, {id:1, description:""}, {id:2, description:""}]}, 
 {id:2, answers:[{id:0, description:""}, {id:1, description:""}, {id:2, description:""}]}, 
 {id:3, answers:[{id:0, description:""}, {id:1, description:""}, {id:2, description:""}]}, 
 {id:4, answers:[{id:0, description:""}, {id:1, description:""}, {id:2, description:""}]}, 
 {id:5, answers:[{id:0, description:""}, {id:1, description:""}, {id:2, description:""}]}, 
 {id:6, answers:[{id:0, description:""}, {id:1, description:""}, {id:2, description:""}]}, 
 {id:7, answers:[{id:0, description:""}, {id:1, description:""}, {id:2, description:""}]}, 
 {id:8, answers:[{id:0, description:""}, {id:1, description:""}, {id:2, description:""}]}, 
 {id:9, answers:[{id:0, description:""}, {id:1, description:""}, {id:2, description:""}]}]

Maybe you have a typo because it is answers not answer

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