ios - Reactive Cocoa: subscribe only to new values -

i'm new reactive cocoa. i'm trying achieve notified every time property value changes. however, don't want notified when property set same value. here's code:

self.testproperty = 0; [[racobserve(self, self.testproperty) skip:1] subscribenext:^(id x) {     nslog(@"did change: %@", x); }];  self.testproperty = 1; self.testproperty = 1; self.testproperty = 1; self.testproperty = 1; self.testproperty = 1; 

and on console's output

> did change: 1 > did change: 1 > did change: 1 > did change: 1 > did change: 1 

i expected "did change" printed once, not five. there way subscribe new values?

there method that, distinctuntilchanged:

[[[racobserve(self, self.testproperty)    skip:1]   distinctuntilchanged]   subscribenext:^(id x) {     nslog(@"did change: %@", x); }];