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![Quick Example
@[Link("pcre")]
lib LibPCRE
# …
end](https://image.slidesharecdn.com/crystal-presentation-161204012747/75/Intro-to-Crystal-Programming-Language-39-2048.jpg)
Uploaded byAdler Hsieh
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.
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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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