数学运算和初等函数 julia> -0.0 == 0.0 true julia> isequal(-0.0, 0.0) false 有符号整数、无符号整数以及浮点数之间的混合类型比较是很棘手的。开发者费了很大精力来确保 Julia 在这个问题上做的是正确的。 对于其它类型，isequal 会默认调用 ==，所以如果你想给自己的类型定义相等，那么就只需要为 == 增加一个方法。如果你想定义一 别：前者都只编码为一个字节，它没有形成任何有效 UTF-8 数据，除非它后面有非常特殊的连接字 节；而后者则都代表 2 字节编码的 Unicode 代码。 如果这些还是太难理解，试着读一下 ” 每个软件开发人员绝对必须知道的最基础 Unicode 和字符集 知识”。它是一个优质的 Unicode 和 UTF-8 指南，或许能帮助解除一些这方面的疑惑。 8.11 版本号字面量 版本号很容易用 v". 适用的通用调用 (像 similar 和-) 实现的。 这只是建议正交化你的方法的一个更加复杂的变种而已。 当这个方法不可行时，这就值得与其他开发者开始讨论如果解决歧义；只是因为一个函数先定义并 不总是意味着他不能改变或者被移除。作为最后一个手段，开发者可以定义” 创可贴” 方法 -(A::MyArrayType{T}, b::Date) where {T<:Date} = ... 可以暴力解决歧义。

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 documentation. – Interfaces for Julia packages are typically described using docstrings, README.md, static web pages, ... • Some developers choose not to export all symbols required to use their package/module Julia is running in a JavaScript VM (JSVM), including e.g. a WebAssembly JavaScript embedding in a web browser. Julia 1.2 This function requires at least Julia 1.2. source Base.Sys.loadavg – Function

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 documentation. – Interfaces for Julia packages are typically described using docstrings, README.md, static web pages, ... • Some developers choose not to export all symbols required to use their package/module Julia is running in a JavaScript VM (JSVM), including e.g. a WebAssembly JavaScript embedding in a web browser. Julia 1.2 This function requires at least Julia 1.2. source Base.Sys.loadavg – Function

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 documentation. – Interfaces for Julia packages are typically described using docstrings, README.md, static web pages, ... • Some developers choose not to export all symbols required to use their package/module Julia is running in a JavaScript VM (JSVM), including e.g. a WebAssembly JavaScript embedding in a web browser. Julia 1.2 This function requires at least Julia 1.2. source Base.Sys.loadavg – Function

documentation. – Interfaces for Julia packages are typically described using docstrings, README.md, static web pages, ... • Some developers choose not to export all symbols required to use their package/module Julia is running in a JavaScript VM (JSVM), including e.g. a WebAssembly JavaScript embedding in a web browser. Julia 1.2 This function requires at least Julia 1.2. source Base.Sys.loadavg – Function 1113 49.1 Example In the example below we use a scoped value to implement a permission check in a web-application. After determining the permissions of the request, a new dynamic scope is entered and

documentation. – Interfaces for Julia packages are typically described using docstrings, README.md, static web pages, ... • Some developers choose not to export all symbols required to use their package/module Julia is running in a JavaScript VM (JSVM), including e.g. a WebAssembly JavaScript embedding in a web browser. Julia 1.2 This function requires at least Julia 1.2. source Base.Sys.loadavg – Function 1107 49.1 Example In the example below we use a scoped value to implement a permission check in a web-application. After determining the permissions of the request, a new dynamic scope is entered and

documentation. – Interfaces for Julia packages are typically described using docstrings, README.md, static web pages, ... • Some developers choose not to export all symbols required to use their package/module Julia is running in a JavaScript VM (JSVM), including e.g. a WebAssembly JavaScript embedding in a web browser. Julia 1.2 This function requires at least Julia 1.2. source Base.Sys.loadavg – Function end 49.1 Example In the example below we use a scoped value to implement a permission check in a web-application. After determining the permissions of the request, a new dynamic scope is entered and

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 documentation. – Interfaces for Julia packages are typically described using docstrings, README.md, static web pages, ... • Some developers choose not to export all symbols required to use their package/module Julia is running in a JavaScript VM (JSVM), including e.g. a WebAssembly JavaScript embedding in a web browser. Julia 1.2 This function requires at least Julia 1.2. source Base.Sys.loadavg – Function

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 documentation. – Interfaces for Julia packages are typically described using docstrings, README.md, static web pages, ... • Some developers choose not to export all symbols required to use their package/module Julia is running in a JavaScript VM (JSVM), including e.g. a WebAssembly JavaScript embedding in a web browser. Julia 1.2 This function requires at least Julia 1.2. source Base.Sys.loadavg – Function

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 documentation. – Interfaces for Julia packages are typically described using docstrings, README.md, static web pages, ... • Some developers choose not to export all symbols required to use their package/module Julia is running in a JavaScript VM (JSVM), including e.g. a WebAssembly JavaScript embedding in a web browser. Julia 1.2 This function requires at least Julia 1.2. source Base.Sys.loadavg – Function