在Ruby中使用具有方法名称的字符串调用方法 [英] Calling a Method From a String With the Method's Name in Ruby

问题描述

我该怎么做他们在说什么

How can I do what they are talking about here, but in Ruby?

您将如何对某个对象执行功能?以及如何执行全局功能(请参阅jetxee的

How would you do the function on an object? and how would you do a global function (see jetxee's answer on the post mentioned)?

示例代码:

event_name = "load"

def load()
  puts "load() function was executed."
end

def row_changed()
  puts "row_changed() function was executed."
end 

#something here to see that event_name = "load" and run load()

更新: 您如何了解全局方法?或我的全局功能?

UPDATE: How do you get to the global methods? or my global functions?

我尝试了此附加行

puts methods

并在未列出的地方加载和row_change.

and load and row_change where not listed.

推荐答案

直接在对象上调用函数

a = [2, 2, 3]
a.send("length")
# or
a.public_send("length")

将按预期返回3

或用于模块功能

FileUtils.send('pwd')
# or
FileUtils.public_send(:pwd)

和本地定义的方法

def load()
    puts "load() function was executed."
end

send('load')
# or
public_send('load')

文档:

• Object#public_send
• Object#send

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