weird part 57–58— function constructor, ‘new’ and ‘.prototype’

#function constructor — a method is inside function

function Person(firstname, lastname){
console.log(this)
  this.firstname = firstname;
  this.lastname = lastname;
  this.getFullName = function(){
   return this.firstname + ' '+ this.lastname;
  }
  console.log('this function is invoked.')
}
var april = new Person('April','Doe')

#.prototype

function Person(firstname, lastname){
console.log('this',this)
  this.firstname = firstname;
  this.lastname = lastname;
  console.log('this function is invoked!')
}
Person.prototype.getFullName = function(){
 return this.firstname + ' ' + this.lastname;
}
var john = new Person('john','doe');
console.log(john)
console.log('fullname',john.getFullName())

.prototype

See the difference between ‘the method getFullName ’ and ‘prototype.getAge’?

#function constructor

• the first letter of function constructor name — capital letter! ‘Person’

# work a lot of Date object

• https://momentjs.com/

#references

https://youtu.be/12QRecyUd28?t=139