Ignore Undefined objects in array of arrays variable - google-apps-script

Question

In Google Apps Script, I'm pulling data from an API. In the code below, the "output" variable contains an array of arrays. There is always at least one ["Response"] object, but sometimes there are 2.
My problem is, the code below isn't returning the second object (["Response"][1]) when it is present. I tried removing the "if" statement, but I get an error saying "TypeError: Cannot read property "Product" from undefined".
Does anyone know how to get the second object when it's present and ignore it when it's not?
var data = reportAPI();
var applications = data["applications"];
var output = []
applications.forEach(function(elem,i) {
output.push(["ID",elem["Id"]]);
output.push([elem["Response"][0]["Product"],elem["Response"][0]["Status"]]);
if (["Response"][1] != null) {
output.push([elem["Response"][1]["Product"],elem["Response"][1]["Status"]]);
}
}
P.S. I would even be happy with replacing the undefined object with "", but I'm not sure how to do it.

Answer 1

How about this modification? Please think of this as one of several answers. I used forEach to elem["Response"]. By this, values can be pushed by the number of elem["Response"].
From :
applications.forEach(function(elem,i) {
output.push(["ID",elem["Id"]]);
output.push([elem["Response"][0]["Product"],elem["Response"][0]["Status"]]);
if (["Response"][1] != null) {
output.push([elem["Response"][1]["Product"],elem["Response"][1]["Status"]]);
}
}
To :
applications.forEach(function(elem) {
output.push(["ID",elem["Id"]]);
elem["Response"].forEach(function(elem2) {
output.push([elem2["Product"],elem2["Status"]]);
});
});
If this didn't work, please tell me. I would like to modify.

Answer 2

The example below helps to account for the cases where the Response[0] or Reponse[1] are not "undefined" or "null". Putting !() will turn the Boolean values for "undefined" or "null" to true.
applications.forEach(function(elem,i) {
output.push(["ID",elem.Id]);
if(!(elem.Reponse[0]))
output.push([elem.Response[0].Product,elem.Response[0].Status]);
if (!(elem.Response[1])) {
output.push([elem.Response[1].Product,elem.Response[1]Status]);
}
}