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What is `binding` object in Ruby?

By Shiva Bhusal on Jun, 03, 2016 in ruby, binding, context, ERB

 

Lets see an example before we explain the term binding

def binding1
  occupation = 'chor'
  binding
end

def binding2
  occupation = 'engineer'
  binding
end

erb = "Ram prasad is <%= occupation %>"
ERB.new(erb).result(binding1)
# => "Ram prasad is chor"
ERB.new(erb).result(binding2)
# => "Ram prasad is engineer"

Looking into the example, some of you might have gotten the idea that binding is nothing more than an object representing a closure where variables/objects are defined. Objects of class Binding encapsulate the execution context at some particular place in the code and retain this context for future use. You can also imagine this as a variable representing container where stuffs are defined.

For more info see this

Example:

class Demo
  def initialize(n)
    @secret = n
  end
  def get_binding
    return binding()
  end
end

k1 = Demo.new(99)
b1 = k1.get_binding
k2 = Demo.new(-3)
b2 = k2.get_binding

eval("@secret", b1)   #=> 99
eval("@secret", b2)   #=> -3
eval("@secret")       #=> nil

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