The Delete Operator In Javascript

I would like to ask questions about 'delete' operator in Javascript Why delete window.document; // returns false but delete navigator.geolocation; // returns true I try other pr

Solution 1:

If you'd like to understand the delete operator, wrap your mind around the javascript spec section 11.4.1

There are several cases where the operator should evaluate to true without mutating any objects.

From 8.12.7, the operator checks checks an internal [[Configurable]] property of the property descriptor to enforce readonly properties.