Class: PrimeTable::TabularView

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(n: 10) ⇒ TabularView

initialize new object with default 10 prime numbers



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# File 'lib/prime_table.rb', line 40

def initialize(n: 10)
  @table = []
  @prime_numbers = GetPrimes.fetch_primes(n)
end

Instance Attribute Details

#prime_numbers ⇒ Object (readonly)

defining the state attributes



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# File 'lib/prime_table.rb', line 37

def prime_numbers
  @prime_numbers
end

#table ⇒ Object (readonly)

defining the state attributes



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# File 'lib/prime_table.rb', line 37

def table
  @table
end

Instance Method Details

#tableize ⇒ Object

shows the product output in STDOUT in tabular form



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# File 'lib/prime_table.rb', line 46

def tableize
  # format the header of the table
  # join all prime numbers with the calculated str_separator
  table_header = "%#{str_separator}s" % '#' # put '#' so to indicate the pointer to row and column conjunction
  @table <<  (table_header << @prime_numbers.collect {|s| "%#{str_separator+1}s" % s}.join(''))

  # get the multiplier value of the prime number with others
  @prime_numbers.map do |x|
    # push the value for the first column of the table
    str = "%#{str_separator}s" % x

    # extract the column values apart for subsequent columns
    @prime_numbers.collect{|w| str << "%#{str_separator+1}s" % (x * w) }

    # puts formatted string to table array
    @table << str
  end

  # displays the table on STDOUT
  @table
end