Class: Sycsvpro::NotAvailable

Inherits:
Object
  • Object
show all
Defined in:
lib/sycsvpro/not_available.rb

Overview

The NotAvailable class is an Eigenclass and used to represent a missing value. It will return if used in any expression always not available.

na = NotAvailable

na + 1 -> na
1 + na -> na

Constant Summary collapse

NA =

The string representation of NotAvailable

"NA"

Class Method Summary collapse

Class Method Details

.coerce(value) ⇒ Object

Catches all expressions where na is not the first argument and swaps value and na, so na is first argument



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# File 'lib/sycsvpro/not_available.rb', line 25

def coerce(value)
  [self,value]
end

.method_missing(name, *args, &block) ⇒ Object

Catches all expressions where na is the first argument



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# File 'lib/sycsvpro/not_available.rb', line 19

def method_missing(name, *args, &block)
  self
end

.respond_to?(name) ⇒ Boolean

Checks whether SpreadSheet responds to ‘name’. The methods :to_ary and :to_str are excluded

Returns:

  • (Boolean) 


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# File 'lib/sycsvpro/not_available.rb', line 31

def respond_to?(name)
  return false if name == :to_ary
  return false if name == :to_str
  super
end

.to_s ⇒ Object

Returns NA as the string representation



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# File 'lib/sycsvpro/not_available.rb', line 38

def to_s
  NA
end