index.js

var synaptic = require('synaptic');

const {Layer, Network} = synaptic;

var inputLayer = new Layer(2);
var hiddenLayer = new Layer(3);
var outputLayer = new Layer(1);

inputLayer.project(hiddenLayer);
hiddenLayer.project(outputLayer);

var myNetwork = new Network({
    input: inputLayer,
    hidden: [hiddenLayer],
    output: outputLayer
});

var learningRate = .3;

for (var i = 0; i < 20000; i++) {
    console.log(`Training Network - Iteration: ${i+1}`)

    myNetwork.activate([0,0]);
    myNetwork.propagate(learningRate, [0]);

    myNetwork.activate([0,1]);
    myNetwork.propagate(learningRate, [1]);

    myNetwork.activate([1,0]);
    myNetwork.propagate(learningRate, [1]);

    myNetwork.activate([1,1]);
    myNetwork.propagate(learningRate, [0]);
}

console.log(myNetwork.activate([0,0])); 
console.log(myNetwork.activate([0,1]));
console.log(myNetwork.activate([1,0]));
console.log(myNetwork.activate([1,1]));