Create and using constructor

construsctors.js

function Fencepost(x, y, postNum) { //Constructor
  this.x = x;
  this.y = y;
  this.postNum = postNum;
  this.connectionsTo = [];
  this.sendRopeTo = function(connectedPost) {
    this.connectionsTo.push(connectedPost);
  };
}

// Using constructor
var post = new Fencepost(-3, 4, 1);