Adding custom properties to a function

Question

Searching for appropriate answer proved difficult because of the existence of many other problems related to my keywords, so I\'ll ask this here.

As we know, functio

Answer 1

test = (function() {
  var a = function() {
    console.log("test is ok");
  };
  a.prop = "property is ok";
  a.method = function(x, y) {
    return x + y;
  }
  return a
})()

test();
console.log(test.prop);
console.log(test.method(3, 4));

Alternatively you have to use getters and setters

var person = {
  firstName: 'Jimmy',
  lastName: 'Smith',
  get fullName() {
    return this.firstName + ' ' + this.lastName;
  },
  set fullName(name) {
    var words = name.toString().split(' ');
    this.firstName = words[0] || '';
    this.lastName = words[1] || '';
  }
}
console.log(person.firstName);
console.log(person.lastName);
console.log(person.fullName);
person.fullName = "Tom Jones";
console.log(person.fullName);