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Intro to Crystal Programming Language
The document introduces the Crystal programming language, which combines Ruby's syntax and ease of use with C's performance and efficiency. It features static type-checking, C bindings, and a macro system for metaprogramming. The document also emphasizes the language's unique capabilities, community involvement, and its current development status.
Intro to Crystal Programming Language
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- 2. About • Adler Hsieh • So=ware Engineer • Contributor of Crystal Language Blog: moGon-express.com adlerhsieh
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- 6. Features • Ruby syntax • Compiled with LLVM • StaGsGcally type-checked • C bindings • Macro system
- 7. Features • Ruby syntax • Compiled with LLVM • StaGsGcally type-checked • C bindings • Macro system • Unix system only
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- 10. Crystal • We love Ruby's efficiency for wriGng code. • We love C's efficiency for running code. • We don't want to write C code to make the code run faster.
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- 27. In Ruby… "foo".send(:upcase) # => "FOO" code= "a = 10 ; a += 10" eval(code) # => 20
- 28. In Crystal… "foo".send(:upcase) # => "FOO" code= "a = 10 ; a += 10" eval(code) # => 20
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- 31. Quick Example foo = 20 macroplus(number) foo += {{number}} end plus(20) puts foo
- 32. Quick Example foo = 20 macroplus(number) foo += {{number}} end plus(20) puts foo 1. Run macros
- 33. Quick Example foo = 20 macroplus(number) foo += {{number}} end plus(20) foo += 20 puts foo 1. Run macros
- 34. Quick Example foo = 20 macroplus(number) foo += {{number}} end plus(20) foo += 20 puts foo 2. Run code
- 35. Quick Example foo = 20 macroplus(number) foo += {{number}} end plus(20) foo += 20 puts foo # => 40 2. Run code
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- 37. Quick Example class Foo getter :bar# => attr_reader setter :baz # => attr_writer property :qux # => attr_accessor def initialize(@bar : Int32) @bar += 10 end end foo = Foo.new(20) foo.bar # => 30
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- 41. Current Status • Start in 2012 • v0.20.0 • SGll need mature libraries
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