CRYSTAL 鿓㶩䗞 NF!EBWZUX 须盘♲"
 

鏤鎙椚䙂 • 3VCZ
괐呔铃岁 • 荈⹛㘗ⴽ䲀㼬⟃⿻ꬆ䢀㘗ⴽ增叆 • 㺂僒之㻨 $
ⴅ䒭䏨竁稟#JOEJOH • 管陼儘劍㾝Ꟛ꧌⚛欴欰剓⢕⻋玑䒭焺 • 欴欰넞佪⾲欰焺 

“ ” 8): 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. 

# 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 㥶姽鸏菛 

# 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 㥶姽鸏菛 # 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 

Code/junk/crystal > $ > crystal http_server.cr Listening on http://0.0.0.0:8080 㥶姽鸏菛 

No content

鏤鎙椚䙂 • 3VCZ
괐呔铃岁 • 荈⹛㘗ⴽ䲀㼬⟃⿻ꬆ䢀㘗ⴽ增叆 • 㺂僒之㻨 $
ⴅ䒭䏨竁稟#JOEJOH • 管陼儘劍㾝Ꟛ꧌⚛欴欰剓⢕⻋玑䒭焺 • 欴欰넞佪⾲欰焺 

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

# ꤏ⴪爚眕 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 

# ꤏ⴪爚眕 array = Array.new(Int32 | String) array << 13 array << "string" 㘗ⴽ䲀㼬⿻㘗ⴽ增叆 

# ꤏ⴪爚眕 array = [] of Int32 | String array << 13 array << "string" 㘗ⴽ䲀㼬⿻㘗ⴽ增叆 

crystal > $ > 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 

crystal > $ > crystal tool context \ --cursor array.cr:3:8 array.cr 1 possible context found | Expr | Type | --------------------------------------- | array | Array(String | Int32) | | array << 13 | Array(String | Int32) | 㘗ⴽ䲀㼬⿻㘗ⴽ增叆 

# ꤏ⴪爚眕 array = [1, "str"] 㘗ⴽ䲀㼬⿻㘗ⴽ增叆 

crystal > $ > 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) 㘗ⴽ䲀㼬⿻㘗ⴽ增叆 

鏤鎙椚䙂 • 3VCZ
괐呔铃岁 • 荈⹛㘗ⴽ䲀㼬⟃⿻ꬆ䢀㘗ⴽ增叆 • 㺂僒之㻨 $
ⴅ䒭䏨竁稟#JOEJOH • 管陼儘劍㾝Ꟛ꧌⚛欴欰剓⢕⻋玑䒭焺 • 欴欰넞佪⾲欰焺 

#include #include /* export function */ EXPORT double cos(double x) { /* return cos(x) */ } $
#*/%*/( 

# lib 爚眕 lib C # In C: double cos(double x) fun cos(value : Float64) : Float64 end C.cos(1.5) #=> 0.0707372 $
#*/%*/( 

# lib 爚眕 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 $
#*/%*/( 

鏤鎙椚䙂 • 3VCZ
괐呔铃岁 • 荈⹛㘗ⴽ䲀㼬⟃⿻ꬆ䢀㘗ⴽ增叆 • 㺂僒之㻨 $
ⴅ䒭䏨竁稟#JOEJOH • 管陼儘劍㾝Ꟛ꧌⚛欴欰剓⢕⻋玑䒭焺 • 欴欰넞佪⾲欰焺 

# Macro 爚眕 macro define_method(name, content) def {{name}} {{content}} end end define_method foo, 1 foo ."$30 

# Macro 爚眕 macro define_method(name, content) def {{name}} {{content}} end end define_method foo, 1 ."$30 # Macro 爚眕 def foo 1 end define_method foo, 1 foo #=> 1 

鏤鎙椚䙂 • 3VCZ
괐呔铃岁 • 荈⹛㘗ⴽ䲀㼬⟃⿻ꬆ䢀㘗ⴽ增叆 • 㺂僒之㻨 $
ⴅ䒭䏨竁稟#JOEJOH • 管陼儘劍㾝Ꟛ꧌⚛欴欰剓⢕⻋玑䒭焺 • 欴欰넞佪⾲欰焺 

crystal > $ > crystal http_server.cr Listening on http://0.0.0.0:8080 /"5*7&
$0%& 

crystal > $ > crystal http_server.cr Listening on http://0.0.0.0:8080 crystal > $ > crystal run http_server.cr Listening on http://0.0.0.0:8080 /"5*7&
$0%& 

crystal > $ > crystal build http_server.cr crystal > $ > ./http_server Listening on http://0.0.0.0:8080 /"5*7&
$0%& 

crystal > $ > crystal build http_server.cr --release crystal > $ > ./http_server Listening on http://0.0.0.0:8080 /"5*7&
$0%& 

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䊺㸤䧭⡎劢ざ⢘荛♳康 

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JSDGSFFOPEFOFU 

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