Quick demo of all_but? method

all_but.rb

class Array
  def all_but?(number = 0)
    count = 0
    if !block_given?
      each { |item| count += 1 if item }
    else
      each { |item| count += 1 if yield(item) }
    end
    count >= length - number
  end
end

puts [2, 4, -1, -3, 9].all_but?(1) { |val| val > -1 }
# => false

puts [2, 4, 1, -3, 9].all_but?(1, &:positive?)
# => true

puts [false, 2, 'hello'].all_but?(1)
# => true

puts [true, 2, 'hello', false, nil].all_but?(1)
# => false