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The "init" section, and '?'.

In the code example below, the object variable "_name" was declared with ? on the RHS.  Using '?' on the RHS of a declaration means you're not sure what the value will be (right now), and will postpone setting it until the init section of the constructor(s).

The init section, is a special area of the constructor, where you make sure ALL object variables have been initialized.  This special section is the first thing in the body of constructor, and contains ZERO logic, only assignments.

[code screenshot]