CODEWITHSUNDEEP
rubyblockselfproc
slyv
slyv

Reputation: 838

Get name of Block while in Block (self) Ruby

I am wondering how to get the name of a block/proc while in the block that will then be passed to a method. I need the name of a block like so:

method("hello") do
  puts "My name is #{self}"
end

Which would print out something like when the method runs the block: 

"My name is #<Proc:0xa3de668@/path/to/file.rb:8>"

Upvotes: 3

Views: 796

Answers (2)

Jikku Jose
Jikku Jose

Reputation: 18804

You can get a reference to the implicitly passed block inside the method yield-ing it, by calling Proc.new (inside the method) without supplying a block. For instance:

def speak
  puts yield
  block = Proc.new # Creates a proc object from the implictly passed block.
  puts block.call
end

speak { "Hello, from implicit block!" }

Upvotes: 1

TKH
TKH

Reputation: 838

Can't do this for blocks, but for procs...

def hello
  puts yield
end

my_proc = Proc.new {"I am #{my_proc}"}

method("hello").call(&my_proc)

#I am <#Proc:0x0...@...>

Upvotes: 0

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