`def` vs `val` vs `lazy val` evaluation in Scala

Question

Am I right understanding that

• def is evaluated every time it gets accessed

• lazy val is evaluated once it gets acce

Answer 1

You are correct. For evidence from the specification:

From "3.3.1 Method Types" (for def):

Parameterless methods name expressions that are re-evaluated each time the parameterless method name is referenced.

From "4.1 Value Declarations and Definitions":

A value definition val x : T = e defines x as a name of the value that results from the evaluation of e.

A lazy value definition evaluates its right hand side e the first time the value is accessed.