How does the `Object#define_singleton_method(symbol, method)` works in ruby?

ruby, ruby-1.9.3, singleton-methods

Solution

A `Proc` object is created by using `lambda`, `proc`, `->`, `Proc.new` or the `&` syntax in a parameter list. A `Method` object can be obtained by using the `method` method and an `UnboundMethod` can be obtained by using the `instance_method` method. So here are examples of each of these:

p = Proc.new {|x| puts x}
m = method(:puts)
um = Object.instance_method(:puts)

define_singleton_method(:my_puts1, p)
define_singleton_method(:my_puts2, m)
define_singleton_method(:my_puts3, um)

my_puts1 42
my_puts2 42
my_puts3 42

Problem

From the `Doc of define_singleton_method` I got two syntax to define the `singleton` method as below : define_singleton_method(symbol) { block } -> proc : With the above syntax I tried the below code and the syntax I understood: ``` define_singleton_method :foo do |params = {}| params end #=> #<Proc:0x20e6b48@(irb):1 (lambda)> foo #=> {} foo(bar: :baz) #=> {:bar=>:baz} foo(bar: :baz ,rar: :gaz ) #=> {:bar=>:baz, :rar=>:gaz} ``` But need someone's help to figure out one example of each with the below syntax. define_singleton_method(symbol, method) -> new_method as per the doc - The method parameter can be a `Proc`, a `Method` or an `UnboundMethod` object. I didn't get any examples there. Can anyone help me here to get one example of against the italic words?

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