yeah, those type save builders / DSLs are nice. But they are a topic on their own, and and wanted to keep it "basic" :-)
I would not consider calcExecTime a builder, since it does not create anything.
btw a method like this already exists in the standard lib - its called measureTimeMillis :-)
actually yes, its build nothing) sorry for disorientation, but I want to show many other features, who can be provided by lambda with receiver.
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