与Ruby访问器方法混淆 [英] confused with Ruby accessor methods
问题描述
我真的很困惑如何在Ruby类中命名方法名称。如果我创建一个访问器，如：
attr_accessor：name
i'm really confused how to name method names in Ruby classes. if i create an accessor like: attr_accessor :name
它创建了以下方法：
name
和
name =
it creates to methods: name and name=
但是当我调用第二个方法时，在名称和 =之间留有空格会有效
but when i call the second method with a whitespace between the 'name' and '=' it works
'n.name ='和'n.name ='都可以。
'n.name=' and 'n.name =' both works.
我读到Ruby忽略空格的地方。那么，为什么我用空格调用由我编写的方法不起作用？
i read somewhere that Ruby ignores whitespaces. Well then, why a method written by me does not work when i call it with whitespace?
def getname
end
def getname end
如果我这样打电话，那是行不通的。为什么？
t.get名称
if i call this way, it doesn't work. why? t.get name
我并不感到惊讶，因为它不起作用。但是我对setter方法（name =）的工作方式感到困惑吗？
i'm not surprised as it does not work. but i'm confused how the setter method (name=) works then?
预先感谢。
推荐答案
设置器在Ruby中很特殊。
Setters are special in Ruby.
实际上，定义以等号结尾的方法名称可以使该名称有资格出现在赋值的左侧。
In fact, defining a method name ending in an equals sign makes that name eligible to appear on the left-hand side of an assignment.
来自 http://www.ruby-doc.org/ docs / ProgrammingRuby / html / tut_classes.html
赋值在Ruby中定义为：
Assignments are defined in Ruby as:
赋值语句将变量或属性的左侧（左值）设置为引用右侧的值（右值）。
An assignment statement sets the variable or attribute on its left side (the lvalue) to refer to the value on the right (the rvalue).
$ b来自 http：//www.ruby的 -doc.org/docs/ProgrammingRuby/html/tut_expressions.html
$ b
所以 n.name = 直接调用设置器 name = 。
n.name = 使用这种特殊的二传手，是因为它以 = 结尾您可以将其用作分配中的左值（即，它可以出现在左侧）。
n.name = is using this special treatment of setters by the fact that it ends in an =, to make it so that you can use it as the lvalue (that is, it can appear on the left side) in an assignment.
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