The value cached is defined inside the definition of the method func(), so
everytime you invoke func() it defines a new local Int named cached.
Change your code to this:
def func(i: => Int): Unit = {
lazy val cached = {
println("Calculating")
i * i
}
println(cached)
println(cached)
println(cached)
}
and you will see that it prints "Calculating" only once each time you
invoke func(), even though func() is now accessing cached three times.
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