JAVASCRIPT

_.extend Example

p = _.extend(Person.prototype, {a:"AAAAAAAA"});
var x =  new p.constructor("some extra stuff");
console.log(x.a);
console.log(x.firstName);
/*has both a="AAAAAAA" and firstName="some extra stuff"*/
/*add stuff to the second, you can think of it as*/

Example Of _.extend

class Person
{
  constructor(firstName)
  {
    this.firstName = firstName
  }
}


 _.extend(Person.prototype, {addedProperty:"ssssxxxxssss"});

const p = new Person("james");
console.log(p.addedProperty);

Example Of _.extend

class Person
{
  constructor(firstName)
  {
    this.firstName = firstName
  }
}

class Thing
{
  constructor()
  {
    this.addProperty = "firstName";
  }
}
 

 _.extend(Person.prototype, Thing.property);

const p = new Person("james");
console.log(p.addedProperty);

Example of _.extend

Person = function(attributes)
{
this.attributes = attributes;
}


_.extend(Person.prototype, {test: function(){return _.clone(this.attributes)}});

const s = new Person("some test text");
 console.log(s.attributes);
 console.log(s.test());
 /*the key to getting attributes to display is using a function(){} and _.clone()*/
/*just test: this.attributes will be undefined*/

Another _extend Example

       Person = function(name)
       {
        this.name = name;
       }

_.extend(Person.prototype, {x: function(){return this.name+"XXXXXXXXX"}});


const p = new Person("John smith");
console.log(p.x());

Another _.extend Example

Person = function(name)
{
  this.name = "name";
  this.a = function(a)
 
 {console.log(a)
 
 }

 this.a(this.name);
  this.b();
}

_.extend(Person.prototype, {x: function(){console.log(this.name)}, b: function(){console.log("BBBBBBBBBBBBB")}});

const p= new Person("XXXX");
p.x();


the above is valid code so long as a this.name exists in the Person.prototype

the this.b() is also valid code so long as b() is added in later at the _.extend() part.