Hooks Hooks Special macros exist that are invoked in some situations as hooks, at compile time: inherited is invoked when a subclass is defined. @type is the inheriting type...

Cache Control Expires Conditional GET ETag Last Modified We refer to HTTP caching as the set of techniques for HTTP/1.1 and implemented by browser vendors in order to make f...

Annotations Applications Object Serialization ORMs Fields Key/value Positional Reading Reading Multiple Annotations Annotations Annotations can be used to add metadata t...

Annotations Applications Object Serialization ORMs Fields Key/value Positional Reading Reading Multiple Annotations Annotations Annotations can be used to add metadata t...

intervalLengthSum intervalLengthSum Calculates the total length of union of all ranges (segments on numeric axis). Syntax intervalLengthSum ( start , end ) Arguments ...

Type inference With type restrictions Without type restrictions 1. Assigning a literal value 2. Assigning the result of invoking the class method new 3. Assigning a variable th...

Type inference With type restrictions Without type restrictions 1. Assigning a literal value 2. Assigning the result of invoking the class method new 3. Assigning a variable th...

宏 宏作用域 插值 宏调用 条件语句 迭代 宏方法定义 钩子 变量刷新 宏 宏是一些预编译的方法（在编译时被加入到抽像语法树中）,这些方法必须是完整有效的Crystal代码。 macro define_method ( name , content ) def {{ name }} {{ content...

Newlines style guide Newlines style guide Rule: separate code with newlines only to group together related logic Rule: separate code and block with newlines Newline before block ...

Enable Cookies Settings Usage Example Enable Cookies Hanami applies “batteries included, but not installed” philosophy. Cookies are a feature that is present but needs to be...