When adding properties to objects in the conventional fashion, either via property access or via an object literal, the properties will be given the following implicit traits:
- configurable: This means the property can be deleted from the object (and if its property descriptor can be changed)
- enumerable: This means the property will be visible to enumerations such as for...in and Object.keys()
- writable: This means the property's value can be changed via an assignment operator (such as obj.prop = ...)
JavaScript gives you the power to turn off these traits individually, but be wary that changes to these traits can obscure the behavior of your code. For example, if a property is described as not being writeable but a ...
