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Next, you need to define increment and decrement methods. Both do their work on the value holder found via the meterValueHolder getter:

MeterDemonstration method definition • instance 
incrementMeter 
  | valueHolder | 
   valueHolder := self meterValueHolder. 
   valueHolder value: valueHolder value + 1. 
MeterDemonstration method definition • instance 
decrementMeter 
  | valueHolder | 
   valueHolder := self meterValueHolder. 
   valueHolder value: valueHolder value - 1.