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kotlinlang

every time when we create SumInt object, function will store in memory? even we didn't call *sumNumber*

you can image that field sumNumber has a backfield, its value is computed on SumInt created by executing sum

did you want sum function called every time when you call get on sumNumber?

yes i want only when i called *sumNumber*

if you want it to be calculated everytime
```val sumNumber get() = sum(firstNumber, secondNumber)```
or if you want it to be calculated the first time it is accessed which the value is then stored
```val sumNumber by lazy { sum(firstNumber, secondNumber) }```