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s was written by %<author>s in %<year>i' + + def to_s + SUMMARY % {title:, author:, year:} + end +end +``` + +```ruby +hobbit = Book.new("The Hobbit", "J.R.R. Tolkien", 1937) +puts hobbit.to_s +=> 'The Hobbit was written by J.R.R. Tolkien in 1937' +``` + +### Creating the Data objects + +Example: + +```ruby +hobbit = Book.new(title: "The Hobbit", author: "J. R. R. Tolkien", year: 1937) +=> <data Book title="The Hobbit", author="J. R. R. Tolkien", year=1937> + +hobbit.author +=> "J. R. R. Tolkien" + +hobbit.year +=> 1937 + +hobbit.title +=> "The Hobbit" +``` + +We can create shallow clones of an instance of Data +Example: + +```ruby + +>> philadelphia = Location[39.9526, -75.1652] +=> #<data Location latitude=39.9526, longitude=-75.1652> +>> philadelphia.latitude +=> 39.9526 +>> philadelphia.longitude +=> -75.1652 +``` + +- Initialize with keyword arguments +- Initialize with positional arguments +- Initialize with brackets (either with keyword or positional arguments) + base-commit: c16dc16959fae3b044be29bf5c7f4c0a4b18f85f -- 2.49.0