State change detection

hi. new arduino programming , forum. want code turning relay on , off momentary pushbutton, 1 click on, next click off. found public code: https://www.arduino.cc/en/tutorial/statechangedetection , changed the   if (buttonpushcounter % 4 == 0) { to  if (buttonpushcounter % 2 == 0) { , worked...

but efficiant way achieve purpouse?

br
staffan

if need 2 states use boolean true false values. 

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