Challenge 2: Symbols Are Identical Objects — Solution

Run in irb:

irb(main):001:0> :status.object_id == :status.object_id
=> true

irb(main):002:0> "status".object_id == "status".object_id
=> false

=begin
Results:
- :status.object_id == :status.object_id  => true
  Every time :status appears in the program, Ruby points to the exact same
  symbol object already stored in memory.

- "status".object_id == "status".object_id  => false
  Each "status" string literal creates a brand new String object, even
  though the text is identical.

Why this matters for hash keys:
Because a symbol is always the same object, Ruby can compare hash keys by
a quick identity check instead of comparing every character of a string.
That makes symbol keys faster to look up and slightly more memory-efficient
than string keys, especially in a hash that gets read from often — which is
exactly why symbol keys are the idiomatic default for Ruby hashes.
=end