gistfile1.rb

def fibs(n)
  results = []
  a, b = 0, 1
  n.times do
    results << a
    a, b = b, a + b
  end
  results
end

def prime?(n)
  return false unless n > 1
  div_num = 2
  while div_num < n
    return false if n % div_num == 0
    div_num += 1
  end
  true
end


def fizzbazz(n)
  (1..n).map do |i|
    case
    when (i % 15).zero? then 'FizzBuzz'
    when (i % 3).zero?  then 'Fizz'
    when (i % 5).zero?  then 'Buzz'
    else i
    end
  end
end

def print_pyramid(n)
  formatter = lambda{|n, pad| " " * pad + "*" * n + "*" * (n - 1) }
  print (1..n).map{|i| formatter[i, n - i] }.join("\n")
end

def commaize(n)
  num = n
  divide_number = 1000
  digits_format = "%03d"
  digits = []
  until num < divide_number
    surplus = num % divide_number
    num = num / divide_number
    digits.unshift digits_format % surplus
  end
  digits.unshift num
  digits.join(",")
end