basic-perceptron.js

function BasicPerceptron(weights, bias) {
    this.weights = weights;
    this.threshold = bias * -1;
}

BasicPerceptron.prototype.run = function run(inputs) {
    var sum = 0.0;
    for (var a = 0; a < inputs.length; a++) {
        sum += inputs[a] * this.weights[a];
    }
    if (sum <= this.threshold) {
        return 0;
    } else {
        return 1;
    }
};

Example:

var nand = new BasicPerceptron([-2, -2], 3);

nand.run([0, 0]); // 1
nand.run([0, 1]); // 1
nand.run([1, 0]); // 1
nand.run([1, 1]); // 0