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Ruby NameError: Undefined local variable


Ruby NameError: Undefined local variable

By : user2953490
Date : November 21 2020, 01:01 AM
Any of those help Just started to go through the 7 languages in 7 weeks book; day one problem make a simple higher or lower game in ruby. When I execute my script I get the following error but I don't know why.
code :
def guess(guess, actual)
  unless guess == actual
    if guess > actual
      puts 'Lower'
    else
      puts 'Higher'
    return false
    end
  end
  puts 'Correct'
  return true
end


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Ruby NameError undefined local variable or method `e

Ruby NameError undefined local variable or method `e


By : user3468825
Date : March 29 2020, 07:55 AM
this will help I have one thing I know and one that's just a wild guess.
The thing I know is that you don't need to call to_s on an overall #{} expression; that will happen automatically. But it does no harm.
ruby on rails NameError: undefined local variable or method 'record'

ruby on rails NameError: undefined local variable or method 'record'


By : fuadmuhtaz
Date : March 29 2020, 07:55 AM
like below fixes the issue The record is passed to :insert_sql as an argument, you would need to do something like:
code :
:insert_sql => proc {|record| "insert into resource_documents (document_id, resource_id, type) values (#{id}, #{record.id}, 'Service')"}
class Document < ActiveRecord::Base

  # ... etc ...

  has_and_belongs_to_many :services,
                          :foreign_key => 'document_id',
                          :association_foreign_key => 'resource_id',
                          :join_table => 'resource_documents',
                          :insert_sql => proc {|record| "insert into resource_documents (document_id, resource_id, type) values (#{id}, #{record.id}, 'Service')"}

 # ... etc ...

end
Ruby: undefined local variable (NameError) -- but it is defined

Ruby: undefined local variable (NameError) -- but it is defined


By : Bram Derudder
Date : March 29 2020, 07:55 AM
Does that help A local variable's scope cannot cross a method definition. positions that is assigned outside of the method definition is not visible from within the method definition.
To make it visible, you can make it an instance variable, class variable, global variable, or constant, for example. Or, you can pass it as an argument to the method.
A Ruby NameError, undefined local variable, was defined

A Ruby NameError, undefined local variable, was defined


By : tnn301
Date : March 29 2020, 07:55 AM
hop of those help? Methods introduce new scope. They are not closures: one should not expect that local variables from the parent scope would be accessible there in the nested scope.
Solution 1: Use constant
code :
POSTAL_CODES = {
  V: "British Columbia",
  # SKIPPED
  B: "Nova Scotia"
}


def lookup_code(postal_code)
  territory = POSTAL_CODES.fetch(postal_code[0].upcase.to_sym)
  puts "Your address is in #{territory}"
end
@postal_codes = {
  V: "British Columbia",
  # SKIPPED
  B: "Nova Scotia"
}


def lookup_code(postal_code)
  territory = @postal_codes.fetch(postal_code[0].upcase.to_sym)
  puts "Your address is in #{territory}"
end
$postal_codes = {
  V: "British Columbia",
  # SKIPPED
  B: "Nova Scotia"
}


def lookup_code(postal_code)
  territory = $postal_codes.fetch(postal_code[0].upcase.to_sym)
  puts "Your address is in #{territory}"
end
class Lookup
  def postal_codes
    @postal_codes ||= {
      V: "British Columbia",
      # SKIPPED
      B: "Nova Scotia"
    }
  end

  def lookup_code(postal_code)
    territory = postal_codes.fetch(postal_code[0].upcase.to_sym)
    puts "Your address is in #{territory}"
  end
end

Lookup.new.lookup_code("01234")
def lookup_code(postal_code)
  territory = {
    V: "British Columbia",
    # SKIPPED
    B: "Nova Scotia"
  }.fetch(postal_code[0].upcase.to_sym)
  puts "Your address is in #{territory}"
end
Ruby :undefined local variable or method `n1' (NameError)

Ruby :undefined local variable or method `n1' (NameError)


By : JeanPaulSatre
Date : March 29 2020, 07:55 AM
I hope this helps . Your puts calls show the correct way to access the option values: options[:n1].
code :
res = options[:n1] + options[:n2]
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