I'm trying to use Ruby 1.9.1 for an embedded scripting language, so that "end-user" code gets written in a Ruby block. One issue with this is that I'd like the users to be able to use the 'return' ...

Joe Van Dyk asked the Ruby mailing list: Hi, In Ruby, I guess you can't marshal a lambda/proc object, right? Is that possible in lisp or other languages? What I was trying to do: l = la...

proc = Proc.new do |name| puts "Thank you #{name}!" end def thank yield end proc.call # output nothing, just fine proc.call('God') # => Thank you God! thank &proc # output nothing, to...

Is it possible to convert a proc-flavored Proc into a lambda-flavored Proc? Bit surprised that this doesn't work, at least in 1.9.2: my_proc = proc {|x| x} my_lambda = lambda &p my_lambda.lam...

I've got a variable that I would like to use as default value for an argument: proc log {message {output $::output}} { .... } Is there a way to do this or need I to evaluate the variable inside...

I recently tried to do something akin to this: a = "some string" b = Proc.new{ upcase } a.instance_eval b Which gives the error: TypeError: can't convert Proc into String but this works: d...

I'm new to programming, and ruby is my first real run at it. I get blocks, but procs seem like a light method/function concept -- why use them? Why not just use a method? Thanks for your help.

This article mentions 4 ways to invoke procs in ruby 1.9, and === is one of them. I don't understand why this would be done this way at all. Does it have any relationship to the normal meaning of =...

I want to have a method defined on Object that takes a block and applies the receiver to the block. An implementation will be like the following: class Object def apply ≺ pr.call(self) end...

The break statement for blocks (as per The Ruby Programming Language) is defined as follows: it causes the block to return to its iterator and the iterator to return to the method that invoked ...

in all the tutorials for RoR I see instances where the coder chose to use Proc.new when seemingly it is both unnecessary and rather unattractive. Example, here is a callback for placed in a model,...

Possible Duplicate: What's the difference between a proc and a lambda in Ruby? When run this Ruby code: def func_one proc_new = Proc.new {return "123"} proc_new.call return "4...

I lifted the following example from Josh Susser def strip_accents params thunk = lambda do |key,value| case value when String then value.remove_accents! when Hash then value.each(&thunk) ...

Say I have a proc and the proc consists of several statements and function calls. How I can know how much time the function has taken so far?

Given the following method that takes one argument: def foo(arg); p arg; end I can call it with an empty array: foo([]) # prints [] I can also save it as a Method object and call that with an...

In Ruby, are there any differences between Proc.new { 'waffles' } and proc { 'waffles' }? I have found very few mentions of the second syntax. From testing using irb, I haven't found any obvious d...

def foo f = Proc.new { return "return from foo from inside proc" } f.call # control leaves foo here return "return from foo" end def bar b = Proc.new { "return from bar from inside proc" } b...

I want to be able to write a lambda/Proc in my Ruby code, serialize it so that I can write it to disk, and then execute the lambda later. Sort of like... x = 40 f = lambda { |y| x + y } save_for_l...