Is there way to add extensions to variables via delegation so that they may be reusable. Possible use case is to add a listener for the change in property, i know this can be done using external variable list containing lambdas and observable delegation but it is not reusable, as we need to create list for every variable we want to became observable, and it also doesn't reads/looks so good because you register observer lambda using member function of class not by the variable itself.

Do you mean like Delegated Properties? https://kotlinlang.org/docs/reference/delegated-properties.html

Not exactly, i want to know that just like extension function is there a way to add some functions to specified properties.

You can only add extensions to types, not to variables or functions. You can only mess around with class properties using property delegation.

observe is not defined anywhere @Marc Knaup

Yeah you have to write it

ohh ok

Depends on what you want to achieve

where do i write .observe(block: ()->Unit)?

hmm, looks like it does require reflection. https://gist.github.com/fluidsonic/2950322899188d7112200a681f02c5fe

Even if its doesn't look so great but Its ok. A quick question What is use of

isAccessible = true

?