basic-perceptron.rb

class BasicPerceptron
  def initialize(weights, bias)
    @weights = weights
    @threshold = bias * -1
  end

  def run(inputs)
    input_weight_pairs = inputs.zip @weights
    sum = 0.0
    input_weight_pairs.each { |input, weight| sum += input * weight }
    sum <= @threshold ? 0 : 1
  end
end

Example:

nand = BasicPerceptron.new [-2, -2], 3

nand.run [0, 0] # 1
nand.run [0, 1] # 1
nand.run [1, 0] # 1
nand.run [1, 1] # 0