Check Properties exist

• Check Properties exist

Syntax:- if (typeof object_name.key !== „undefined‟)

Ex:-

Check Properties exist

• in operator

Syntax: – if („key‟ in object_name)

Ex:-

Check Properties exist

• hasOwnProperty ()

Syntax: – if (object_name.hasOwnProperty(“key”))

Ex:-

Tagged : check properties / hasOwnProperty () / in operator / Javascript / objects