Symbol object represents a Ruby name and is generated automatically using the
:name literal syntax. The same
Symbol object will be created for a given name string for the duration of a program's execution, regardless of the context or meaning of that name. Thus if
Fred is a constant in one context, a method in another, and a class in a third, the
:Fred will be the same object in all three contexts.
module One class Fred end $f1 = :Fred end module Two Fred = 1 $f2 = :Fred end def Fred() end $f3 = :Fred $f1.id → 2305294 $f2.id → 2305294 $f3.id → 2305294
:fred.id2name → "fred"
:fred.inspect → ":fred"
Extracted from the book "Programming Ruby - The Pragmatic Programmer's Guide"
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