Why am i getting output as [object Object] instead of [Id: id_value] when using Spidermonkey

Question

I was using vi editor on my mac terminal and writing some Javascript codes. When i used Spidermonkey Engine to run on this code:

function getPerson(id) {
  if (id < 0) {
    throw new Error('ID must not be negative: '+id);
  }
  return { id: id };
}

function getPersons(ids) {
  var result = [];
  ids.forEach(function (id) {
    try {
      var person = getPerson(id);
      result.push(person);
    } catch (exception) {
      print(exception);
  }
});
return result;
}

When i run the following commands:

js -f exc.js -i
js> getPersons([1,-2,3]);

I get the following response:

Error: ID must not be negative: -2
[object Object],[object Object]

Instead of:

Error: ID must not be negative: -2
{ id: 1 }, { id: 3 }

So, how am i supposed to correct this?

Answer 1

If you have control on where the object is printed, try using JSON.stringify on the object before printing it.

Possibly this may work (not tested):

js> JSON.stringify(getPersons([1,-2,3]));