Challenge 2: JSON Round Trip — Solution

require "json"

profile = { name: "Philip", email: "philip@example.com", tags: ["ruby", "php", "python"] }

json_string = profile.to_json
puts json_string

parsed = JSON.parse(json_string, symbolize_names: true)
puts parsed[:name]
puts parsed.keys.first.class

=begin
Output:
{"name":"Philip","email":"philip@example.com","tags":["ruby","php","python"]}
Philip
Symbol

Notes:
- profile.to_json converts the hash into a plain JSON string — the output
  shows plain "name" rather than the Ruby-specific :name symbol syntax,
  because JSON itself has no concept of symbols at all.
- JSON.parse(json_string, symbolize_names: true) explicitly asks Ruby to
  convert every key back into a symbol as it parses; without that option,
  parsed.keys.first.class would print String instead of Symbol.
- This demonstrates the chapter's warning directly: JSON round-trips
  through plain strings by default, and symbolize_names: true is required
  to get symbol keys back, matching the original hash's key type.
=end