簡潔優雅的語言 —— Crystal

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8IZ • We love Ruby's efficiency for writing code. •
We love C's efficiency for running code. • We want the best of both worlds. • We want the compiler to understand what we mean without having to specify types everywhere. • We want full OOP. • Oh, and we don't want to write C code to make the code run faster. IUUQTHJUIVCDPNDSZTUBMMBOHDSZTUBM

(PBMT • Same syntax as Ruby, or at least as
similar as possible. • Statically type-checked but without having to specify the type of variables or method arguments. • Be able to call C code by writing bindings to it in Crystal. • Have compile-time evaluation and generation of code, to avoid boilerplate code. • Compile to efficient native code. IUUQTHJUIVCDPNDSZTUBMMBOHDSZTUBM

-JLFUIJT # 矦僒 HTTP ⠿剪㐼 require "http/server" server = HTTP::Server.new(8080)
do |request| HTTP::Response.ok "text/plain", "Hello world, got #{request.path}!" end puts "Listening on http://0.0.0.0:8080" server.listen

-JLFUIJT # 矦僒 HTTP ⠿剪㐼 require "http/server" server = HTTP::Server.new(8080)
do |request| HTTP::Response.ok "text/plain", "Hello world, got #{request.path}!" end puts "Listening on http://0.0.0.0:8080" server.listen # Ruby 괐呔鏽鍑䒸Ⰵⴅ䒭䏨䒊用 Server 暟⟝ 㼩倴䨾剤锞宠㔐⫄ HTTP 200 ⟃⿻Ⰹ㺂 곏爚鎝䜂 Ꟛ㉖ Server

-JLFUIJT $ crystal http_server.cr Listening on http://0.0.0.0:8080

-JLFUIJT

㘗ⴽ䲀㼬⿻㘗ⴽ增叆 array = [1, 2, 3, 4, 5] array <<
"string"

㘗ⴽ䲀㼬⿻㘗ⴽ增叆 array = [1, 2, 3, 4, 5] array <<
"string" Error in ./array.cr:2: no overload matches 'Array(Int32)#<<' with types String Overloads are: - Array(Int32)#<<(value : Int32) array << "string” ^~

㘗ⴽ䲀㼬⿻㘗ⴽ增叆 array = Array.new(Int32 | String) array << 13 array
<< "string" array = [] of Int32 | String array << 13 array << "string"

㘗ⴽ䲀㼬⿻㘗ⴽ增叆 $ crystal tool context \ --cursor array.cr:3:1 array.cr 1
possible context found | Expr | Type | --------------------------------- | array | Array(String | Int32) |

㘗ⴽ䲀㼬⿻㘗ⴽ增叆 array = [1, "str"]

㘗ⴽ䲀㼬⿻㘗ⴽ增叆 array = [1, "str"] $ crystal tool context \
--cursor array.cr:2:1 array.cr 1 possible context found | Expr | Type | --------------------------------------------------- | array | Array(String | Int32) | | ::Array(typeof(1, "str")).build(2) do |__temp_111| __temp_111[0] = 1 __temp_111[1] = "str" 2 end | Array(String | Int32) |

㘗ⴽ䲀㼬⿻㘗ⴽ增叆 ::Array(typeof(1, "str")).build(2) do |__temp_111| __temp_111[0] = 1 __temp_111[1] =
"str" 2 end #=> Array(String | Int32)

$#JOEJOH #include <stdio.h> #include <stdlib.h> /* export function */ EXPORT
double cos(double x) { /* return cos(x) */ }

$#JOEJOH @[Link("cos")] # Link flag lib C # In C:
double cos(double x) fun cos(value : Float64) : Float64 end C.cos(1.5) #=> 0.0707372

$#JOEJOH @[Link("cos")] # Link flag lib C # In C:
double cos(double x) fun cos(value : Float64) : Float64 end C.cos(1.5) #=> 0.0707372 https://github.com/manastech/crystal_lib

.BDSP # Macro 爚眕 macro define_method(name, content) def {{name}} {{content}}
end end define_method foo, 1 foo

.BDSP # Macro 爚眕 macro define_method(name, content) def {{name}} {{content}}
end end define_method foo, 1 foo # Macro 爚眕 def foo 1 end define_method foo, 1 foo #=> 1

/BUJWF$PEF $ crystal http_server.cr Listening on http://0.0.0.0:8080

/BUJWF$PEF $ crystal http_server.cr Listening on http://0.0.0.0:8080 $ crystal run
http_server.cr Listening on http://0.0.0.0:8080

/BUJWF$PEF $ crystal build http_server.cr $ ./http_server.cr Listening on http://0.0.0.0:8080

/BUJWF$PEF $ crystal build http_server.cr $ ./http_server.cr Listening on http://0.0.0.0:8080
$ crystal build --release http_server.cr $ ./http_server.cr Listening on http://0.0.0.0:8080

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4IBSET%FQFOEFODZNBOBHFS name: shards version: 1.2.3 dependencies: openssl: github: datanoise/openssl.cr branch:
master development_dependencies: minitest: git: https://github.com/ysbaddaden/minitest.cr.git version: "~> 0.1.0" scripts: postinstall: make ext license: MIT

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簡潔優雅的語言 —— Crystal

簡潔優雅的語言 —— Crystal

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