window[“name”] and window.name in javascript

Question

I'm a beginner of javascript. Here is my question.

Is there any difference between window["property_name"] and window.property_name in javascript?

Answer 1

These forms are identical when name is a valid JavaScript identifier ; in this case the property name is "name" .

The form with braces is required when the property name is an arbitrary expression ( obj[propNameVariable] ) or the property name is not a valid identifier ( obj["invalid identifier"] ).

All property names in JavaScript are internally strings.