如何获得可能具有未定义键的Object值？

Question

something like angular 's $parse service.

If there is an object like this:

const obj = {
  items: [
    {
      store: {
        type: ''
      }
    }
  ]
};

watch : the keys items and store and type possible are undefined , or no exist.

I want to get the first item 's type, here is my code:

const firstItem = obj.items[0] || {};
const store = firstItem.store || {};
const type = store.type || 'computer';

I think there is a better way to do this. I know angular 's $parse service is simple to do that. Is there a way like angular 's $parse service or any other ideas? Thanks!

Answer 1

Why not to use try catch.

var type;
try {
    type = obj.items[0].store.type;
}
catch {
    type = 'computer';
}

Answer 2

if(!angular.isUndefined(obj))
{
   if(angular.isArray(obj.items)){
       // Do something
   }
}

Is there you need ?