Ruby - Iterating over and calling an array of methods

Question

Lets say I have two methods:

def hello
 'hello'
end

def world
 'world'
end

Now I want to call these methods in a fashion like this:

try_retry{
  hello
}
try_retry{
  world
}

assume try_retry is a method that will retry the block of code if an error happens. There are a lot of these methods so is it possible to iterate over the blocks? Something like:

array_of_methods = [hello,world]
array_of_methods.each do |method|
  try_retry{
    method
  }
end

the problem is the methods get evaluated on this line:

array_of_methods = [hello,world]

Ursus · Accepted Answer · 2016-10-20 18:47:59Z

1

You can do

array_of_methods = [method(:hello), method(:world)]

And you can call them like

array_of_methods.each { |m| m.call }

edited Oct 20, 2016 at 18:47

answered Oct 20, 2016 at 18:42

Ursus

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1 Comment

Eli Sadoff Over a year ago

Note: with this answer method(:hello) is an object for the method hello and does not directly call the method. This is very nice because you have more options as to what to do with the method, but if you are only calling the method, using send is more efficient.

Eli Sadoff · Accepted Answer · 2016-10-20 18:43:07Z

0

Let's say that you have the methods hello and world. If you want to call these methods while iterating over them, you can do it as such

['hello', 'world'].each do |m|
  send(m)
end

answered Oct 20, 2016 at 18:43

Eli Sadoff

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1 Comment

Stefan Over a year ago

Method names are usually symbols. Besides, you have to call send within try_retry { ... } to actually solve the OPs problem.

C dot StrifeVII · Accepted Answer · 2016-10-20 19:25:11Z

0

Depending on the origin of this array of method names you might not want to allow private or protected methods to get called so public_send will allow for only public methods to be called.

array_of_methods = ['hello', 'world']

array_of_methods.each {|m| public_send(m)}

answered Oct 20, 2016 at 19:25

C dot StrifeVII

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