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Crystal 0.5.4 released!

Ary Borenzweig

Crystal 0.5.4 has been released!

The GitHub repository recently surpassed the 1000 stars, which might mean there’s real interest in this language. Let’s make it possible and have fun along the way! :-)

This release includes many bugs fixes and small improvements, like naming consistency.

Most notably, you can now subclass generic types.

# Define a new generic class that subclass another one
class MyArray(T) < Array(T)

# Define a non-generic class that subclass an instance of a generic another one
class MyInt32Array < Array(Int32)

There’s also a more compact way to define JSON mappings:

require "json"

class Person
    name: String,
    age: Int32

person = Person.from_json %({"name": "John", "age": 30})
p person #=> #<Person:0x10220CF20 @name="John", @age=30>

Please read the Changelog for all the details.

You can install Crystal by following these instructions.


We’d like to thank everyone that help us by sending pull requests, suggesting improvements and changes, adding documentation, fixing tpyos and talking about it in social media like Twitter and Reddit.