Ruby赋值语法 [英] Ruby Assignment Syntax

问题描述

一个愚蠢的句法问题:

如果赋值运算符确实是一个函数，例如

If the assignment operator is really a function, like

def value=(x)
  @value = x
end

在左操作数和"="之间没有空格，那么为什么可以将赋值指定为test.value = x(带空格)，但是方法定义不能写为:

without a space between the left-hand operand and the "=", then why can the assignment be made as test.value = x (with a space), but the method definition cannot be written as:

def value = (x)
  @value = x
end

带有空格.这仅仅是语法分析器所规定的语法吗?

with the space. Is this simply syntax dictated by the parser?

推荐答案

def后面必须是函数名称的标记，可以选择后面是参数列表.参数列表上的括号是可选的(例如，def value= x是适当的定义). def value = (x)看起来像def，后跟两个标记，然后是一个不解析的参数列表.

def needs to be followed by a token for the function name, optionally followed by an argument list. The parenthesis on the argument list is optional (e.g., def value= x is an appropriate definition). def value = (x) looks like def followed by two tokens and then an argument list, which does not parse.

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