Ruby 英语

Ruby 中使用的英语词汇有且只有下面 41 个，这些词也称为关键词或者保留词，整个编程语言就是基于这些词汇进行编写。具体如下：

__ENCODING__: 当前程序文件使用的编码
__LINE__: 此关键词在当前文件里出现的位置行号
__FILE__: 当前文件的路径
BEGIN: 在当前程序文件中最先运行
END: Runs after any other code in the current file. See miscellaneous syntax
alias: 为一个方法创建别名建立起两个方法之间的联系
and: 惰性布尔（Short-circuit Boolean）值，优先级低于 &&
begin: 启动异常处理块
break: 跳出程序块
case: 开始一种情形（case）表达式
class: 创建或者打开一个类
def: 定义方法
defined?: 返回描述其参数的字符串
do: 开始一段程序块
else: The unhandled condition in case, if and unless expressions. See control expressions syntax
elsif: An alternate condition for an if expression. See control expressions syntax
end: The end of a syntax block. Used by classes, modules, methods, exception handling and control expressions.
ensure: Starts a section of code that is always run when an exception is raised. See exceptions syntax
false: Boolean false. See literals
for: A loop that is similar to using the each method. See control expressions syntax
if: Used for if and modifier if statements. See control expressions syntax
in: Used to separate the iterable object and iterator variable in a for loop. See control expressions syntax It also serves as a pattern in a case expression. See pattern matching
module: Creates or opens a module. See modules and classes syntax
next: Skips the rest of the block. See control expressions syntax
nil: A false value usually indicating “no value” or “unknown”. See literals
not: Inverts the following boolean expression. Has a lower precedence than !
or: Boolean or with lower precedence than ||
redo: Restarts execution in the current block. See control expressions syntax
rescue: Starts an exception section of code in a begin block. See exceptions syntax
retry: Retries an exception block. See exceptions syntax
return: Exits a method. See methods syntax. If met in top-level scope, immediately stops interpretation of the current file.
self: The object the current method is attached to. See methods syntax
super: Calls the current method in a superclass. See methods syntax
then: Indicates the end of conditional blocks in control structures. See control expressions syntax
true: Boolean true. See literals
undef: Prevents a class or module from responding to a method call. See modules and classes syntax
unless: Used for unless and modifier unless statements. See control expressions syntax
until: Creates a loop that executes until the condition is true. See control expressions syntax
when: A condition in a case expression. See control expressions syntax
while: Creates a loop that executes while the condition is true. See control expressions syntax
yield: Starts execution of the block sent to the current method. See methods syntax

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