Class: PrintPrimesTable::Primes

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

Overview

To handle the primes numbers

Author:

  • Diego Hernán Piccinini Lagos

Instance Method Summary collapse

Constructor Details

#initialize(total = DEFAULT_TOTAL) ⇒ Primes

Returns a new instance of Primes.

Parameters:

  • total (Integer) (defaults to: DEFAULT_TOTAL) —

    the quantity of the primes collection



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# File 'lib/print_primes_table/primes.rb', line 11

def initialize(total = DEFAULT_TOTAL)
  @total=total
  @collection = []
  fill_collection
end

Instance Method Details

#fill_collection ⇒ Object

fill the collection with primes number end when the collection.count is equal total



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# File 'lib/print_primes_table/primes.rb', line 18

def fill_collection
  eval_number = 2
  begin
    has_divisors = false
    @collection.each do |prime|
      if (eval_number % prime) == 0
        has_divisors = true
        break
      end
    end
    # only the numbers has not divisors are primes
    @collection.push eval_number unless has_divisors
    eval_number += 1
  end until @collection.count == @total
end

#list_numbers ⇒ Object

print the list of primes collection separed by tab



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# File 'lib/print_primes_table/primes.rb', line 34

def list_numbers
  puts @collection.join("\t")
end

#print_table ⇒ Object

print the table of TOTAL x TOTAL collection each coordinate contain the product



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# File 'lib/print_primes_table/primes.rb', line 40

def print_table
  headings =[' '] + @collection
  rows=[]
  @collection.each do |prime|
    rows.push [prime] + @collection.map { |a| prime * a}
  end
  table = Terminal::Table.new :headings => headings, :rows => rows
  puts table
end