typeofreturn the type of the object, but array, object, date, regex, etc all just return
"object". [see “typeof” Operator]
instanceofchecks if a object is in the Prototype Chain of a function's property
"prototype"'s value. [see instanceof Operator]
- Property key
"constructor"is meant to return the function that created the object.
TIP: You shoud avoid using any of them, because they are not reliable.
Instead, check directly what you are looking for, by:
- Check for parent object. [see Get/Set Prototype]
- Check for the exact “subtype” of a object. [see Determine Type of Object]
- Check for the exact property, own or inherited. [see Check Property Existence]