Symbol

TODO

Symbols are labels or identifiers.
Symbols are cheaper than strings (in terms of computer memory.)
If you use a word over and over in your program, use a symbol.
Rather than having thousands of copies of that word in memory, the computer will store the symbol only once.

Symbols will have same object id:#

[158] pry(main)> :hello
=> :hello
[159] pry(main)> :hello.object_id
=> 2384988

[160] pry(main)> :hello
=> :hello
[161] pry(main)> :hello.object_id
=> 2384988

Changing String to Symbol Ruby:#

pry(main)> "test".to_sym
=> :test

Changing Symbol to String Ruby:#

[39] pry(main)> :test.to_s
=> "test"