[Vuejs]-Obj.hasOwnProperty always returns false even after property created

Vue (2, anyway) cannot detect property addition or removal.

You should declare the test property within stocks, so that it’s there from the beginning:

stocks : [
    {'name' : 'Tesla', 'price' : 800, test: false },
    {'name' : 'Microsoft', 'price' : 300, test: false },
]

Then it’ll be reactive and you can show/hide your element based on the value of test.