An implemenation of new operator

new.js

function Point({x, y}){
  this.x = x;
  this.y = y;
}

Point.methods = {
  distance: function(pt){
    return Math.abs(pt.x - this.x) + Math.abs(pt.y - this.y);
  },
  norm: function(){
    return this.x + this.y;
  },
  toString: function(){
    return `(${this.x}, ${this.y})`;
  }
};

function create(initializer, ...args){
  const argList = Array.prototype.slice.apply(args);
  const obj = {};
  for(i in initializer.methods || {}){
    obj[i] = initializer.methods[i];
  }
  initializer.apply(obj, argList);
  obj.template = initializer;
  return obj;
}

const kindOf = (obj, func) => obj.template === func;

function main(){
  const zero = create(Point, {x: 0, y: 0});
  const p = create(Point, {x: 10, y: 10});

  console.log(`${zero} is a kind of Point: ${kindOf(zero, Point)}`);
  console.log(`${p} is a kind of Point: ${kindOf(p, Point)}`);  
  console.log(`distance from ${zero} to ${p}: ${p.distance(zero)}`);  
}

main();