Method vs Functions, and other questions

Question

With respect to JS, what\'s the difference between the two? I know methods are associated with objects, but am confused what\'s the purpose of functions? How does the syntax

Answer 1

A function executes a list of statements example:

 function add() { 
     var a = 2; 
     var b = 3;
     var c = a + b;
     return c;
 }

1) A method is a function that is applied to an object example:

 var message = "Hello world!";
 var x = message.toUpperCase(); // .toUpperCase() is a built in function

2) Creating a method using an object constructor. Once the method belongs to the object you can apply it to that object. example:

function Person(first, last, age, eyecolor) {
    this.firstName = first;
    this.lastName = last;
    this.age = age;
    this.eyeColor = eyecolor;
    this.name = function() {return this.firstName + " " + this.lastName;};
}

document.getElementById("demo").innerHTML = person.fullName(); // using the 
method 

Definition of a method: A method is a property of an object that is a function. Methods are defined the way normal functions are defined, except that they have to be assigned as the property of an object.