Question

I have a javascript object of the following form:

{ url1: {status: "ok", updatedAt: someDate1},
  url2: {status: "error", updatedAt: someDate2},
  url3: {status: "error", updatedAt: someDate3},
  ...
}

I want to create a new object that contains all the elements which “status” property is “error”.
In the example above I want the following object to be created:

  { url2: {status: "error", updatedAt: someDate2},
    url3: {status: "error", updatedAt: someDate3} 
  }

Answer 1

This should do what you need (o is your original object):

var errorObj = {};
for (k in o){
    var v = o[k];
    if (v.status === 'error'){
        errorObj[k] = v;
    }
}