Runtime assertions for Ruby
literal.fun
ruby
Merge branch 'main' of https://github.com/joeldrapper/literal
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README.md
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README.md
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### `_Class(T)`
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The `_Class` type ensures the given value is a calss and subclasses the given `T` class.
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The `_Class` type ensures the given value is a class and subclasses the given `T` class.
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```ruby
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attribute :error, _Class(RuntimeError)
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attribute :degrees _Float(0..360)
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```
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You can also compose these types together to form more complex types.
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You can also compose these types together to form more complex types. You can also save your own types as constants for re-use.
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```ruby
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AttributeType = Literal::Types::_Union(String, Symbol, Literal::Types::_Interface(:to_s))
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```
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Note unless you've extended `Literal::Types`, you'll need to reference the types by their fully qualified names. These types are methods, so why are we accessing them with `::`? It's a little known fact that `::` can stand in for `.` in Ruby. I like using `::` here becuase it makes these look more like normal generics. If you prefer, you can use `.`, e.g. `Literal::Types._Interface(:to_s)`.
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## Writing your own type matchers
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