wrong-inheritance-test-3.js

var A = function() {
  this.a = [];
}
A.prototype.hello = function() {
  console.log('Hello from A!');
}

var B = function(a) {
  if (a) {
    this.a = a;
  }
}

B.prototype = new A();

var b = new B();
var c = new B();

b.a.push('hello');
console.log(c.a); //['hello']