朋友阅读中文社区提供的 Julia 入门指引，也推荐你在中文论坛对遇到的问题进行提问。 关于中文文档 Julia 语言相关的本地化工作是一个由社区驱动的开源项目 JuliaZH.jl，旨在方便 Julia 的中 文用户。我们目前使用 Transifex 作为翻译平台。翻译工作正在进行，有任何疑问或建议 请到社区论坛文档区反馈。若有意参与翻译工作，请参考翻译指南。 Chapter 1 鸣谢 7 Chapter 为不同的参数类型，自动生成高效、专用的代码 • 接近 C 语言的性能 尽管人们有时会说动态语言是“无类型的”，但实际上绝对不是这样的：每一个对象都有一个类型， 无论它是基础的类型（primitive）还是用户自定义的类型。大多数的动态语言都缺乏类型声明，这意 味着程序员无法告诉编译器值的类型，也就无法显式地讨论类型。另一方面，在静态语言中，往往 必须标注对象的类型。但类型只在编译期才存在，而无法在运行时进行操作和表达。而在 specific）的定义上去。这 样的编程模型非常适合数学化的编程，尤其是在传统的面向对象派发中，一些函数的第一个变量理 论上并不“拥有”这样一个操作时。在 Julia 中运算符只是函数的一个特殊标记——例如，为用户定 义的新类型添加加法运算，你只要为 + 函数定义一个新的方法就可以了。已有的代码就可以无缝接 入这个新的类型。 9 10 CHAPTER 2. 简介 Julia 在设计之初就非常看重性能，再

for inspecting graphs, flamegraphs and more • ProfileCanvas.jl is a HTML canvas based profile viewer UI, used by the Julia VS Code extension, but can also generate interactive HTML files. An entirely independent 34-element Array{String,1}: ".circleci" ".freebsdci.sh" ".git" ".gitattributes" ".github" "test" "ui" "usr" "usr-staging" julia> pwd() "/home/JuliaUser" source Base.Filesystem.readdir – Function ulia") julia> readdir() 30-element Array{String,1}: ".appveyor.yml" ".git" ".gitattributes" "ui" "usr" "usr-staging" julia> readdir(join=true) 30-element Array{String,1}: "/home/JuliaUser/dev/julia/

for inspecting graphs, flamegraphs and more • ProfileCanvas.jl is a HTML canvas based profile viewer UI, used by the Julia VS Code extension, but can also generate interactive HTML files. An entirely independent 34-element Array{String,1}: ".circleci" ".freebsdci.sh" ".git" ".gitattributes" ".github" "test" "ui" "usr" "usr-staging" julia> pwd() "/home/JuliaUser" source Base.Filesystem.readdir – Function ulia") julia> readdir() 30-element Array{String,1}: ".appveyor.yml" ".git" ".gitattributes" "ui" "usr" "usr-staging" julia> readdir(join=true) 30-element Array{String,1}: "/home/JuliaUser/dev/julia/

for inspecting graphs, flamegraphs and more • ProfileCanvas.jl is a HTML canvas based profile viewer UI, used by the Julia VS Code extension, but can also generate interactive HTML files. An entirely independent 100%|████████████████████████████████| Time: 0:00:00 Main binary filename not available. Serving web UI on http://localhost:62261 "alloc-profile.pb.gz" Then you can view the profile by navigating to h 34-element Array{String,1}: ".circleci" ".freebsdci.sh" ".git" ".gitattributes" ".github" "test" "ui" "usr" "usr-staging" julia> pwd() "/home/JuliaUser" source Base.Filesystem.readdir – Function

for inspecting graphs, flamegraphs and more • ProfileCanvas.jl is a HTML canvas based profile viewer UI, used by the Julia VS Code extension, but can also generate interactive HTML files. An entirely independent 100%|████████████████████████████████| Time: 0:00:00 Main binary filename not available. Serving web UI on http://localhost:62261 "alloc-profile.pb.gz" Then you can view the profile by navigating to h 34-element Array{String,1}: ".circleci" ".freebsdci.sh" ".git" ".gitattributes" ".github" "test" "ui" "usr" "usr-staging" julia> pwd() "/home/JuliaUser" source Base.Filesystem.readdir – Function

for inspecting graphs, flamegraphs and more • ProfileCanvas.jl is a HTML canvas based profile viewer UI, used by the Julia VS Code extension, but can also generate interactive HTML files. An entirely independent 100%|████████████████████████████████| Time: 0:00:00 Main binary filename not available. Serving web UI on http://localhost:62261 "alloc-profile.pb.gz" Then you can view the profile by navigating to h 34-element Array{String,1}: ".circleci" ".freebsdci.sh" ".git" ".gitattributes" ".github" "test" "ui" "usr" "usr-staging" julia> pwd() "/home/JuliaUser" source Base.Filesystem.readdir – Function

for inspecting graphs, flamegraphs and more • ProfileCanvas.jl is a HTML canvas based profile viewer UI, used by the Julia VS Code extension, but can also generate interactive HTML files. An entirely independent 100%|████████████████████████████████| Time: 0:00:00 Main binary filename not available. Serving web UI on http://localhost:62261 "alloc-profile.pb.gz" Then you can view the profile by navigating to h 34-element Vector{String}: ".circleci" ".freebsdci.sh" ".git" ".gitattributes" ".github" "test" "ui" "usr" "usr-staging" julia> pwd() "/home/JuliaUser" source Base.Filesystem.readdir – Function

for inspecting graphs, flamegraphs and more • ProfileCanvas.jl is a HTML canvas based profile viewer UI, used by the Julia VS Code extension, but can also generate interactive HTML files. An entirely independent 100%|████████████████████████████████| Time: 0:00:00 Main binary filename not available. Serving web UI on http://localhost:62261 "alloc-profile.pb.gz" Then you can view the profile by navigating to h 34-element Vector{String}: ".circleci" ".freebsdci.sh" ".git" ".gitattributes" ".github" "test" "ui" "usr" "usr-staging" julia> pwd() "/home/JuliaUser" source Base.Filesystem.readdir – Function

for inspecting graphs, flamegraphs and more • ProfileCanvas.jl is a HTML canvas based profile viewer UI, used by the Julia VS Code extension, but can also generate interactive HTML files. An entirely independent 100%|████████████████████████████████| Time: 0:00:00 Main binary filename not available. Serving web UI on http://localhost:62261 "alloc-profile.pb.gz" Then you can view the profile by navigating to h 34-element Vector{String}: ".circleci" ".freebsdci.sh" ".git" ".gitattributes" ".github" "test" "ui" "usr" "usr-staging" julia> pwd() "/home/JuliaUser" source Base.Filesystem.readdir – Function

for inspecting graphs, flamegraphs and more • ProfileCanvas.jl is a HTML canvas based profile viewer UI, used by the Julia VS Code extension, but can also generate interactive HTML files. An entirely independent 100%|████████████████████████████████| Time: 0:00:00 Main binary filename not available. Serving web UI on http://localhost:62261 "alloc-profile.pb.gz" Then you can view the profile by navigating to h 34-element Vector{String}: ".circleci" ".freebsdci.sh" ".git" ".gitattributes" ".github" "test" "ui" "usr" "usr-staging" julia> pwd() "/home/JuliaUser" source Base.Filesystem.readdir – Function