find updated field in object - scope.$watch - angularjs -

if do:

scope.$watch('obj', function(newobj, oldobj) {   //... }, true); 

how find key-value pair in object changed?

.

only understand try do:

i have object of form:

scope.actions = {   action1: false,   action2: false } 

when boolean changes, want assign function calls it. like, do-action - undo-action.

so watch following way:

scope.$watch('actions', function(newobj, oldobj) {    /*pseudo code start*/    if (action1 changed && action1 true) {     do-func1();   }   if (action1 changed && action1 false) {     undo-func1();   }   ...   /*pseudo code end*/  }, true); 

my problem here is, if check values boolean, functions called. point here is, how find changed key-value pair in object?

scope.$watch('actions', function(newactions, oldactions) {     for(var in newactions) {         if(newactions.hasownproperty(i)) {             var newaction = newactions[i];             var oldaction = oldactions[i];              if(newaction !== oldaction) {                 if(newaction === true) {                     doactions[i](); // do-func-i();                 } else if (newaction === false) {                     undoactions[i](); // undo-func-i();                 }             }         }     } }, true); 

doactions here conventional map of actions

doactions = {     action1 : function() {         console.log('action1');     },     action2 : function() {         console.log('action2');     } } 

doactions['action1'] reference first function

you may have array well, you'll need introduce index fetch proper function doactions[0]