Class PPT

Agenda

• Language Fundamentals
• Functions
• Object
• Class
• Array

Variable Scope

1. global

   • a variable declared outside any function

   • can be declared with or without var keyword

   • can be accessed outside or inside any function

   • E.g.

     num = 100;
     var salary = 4.5;
     

   • can be declared inside a function without using a var keyword

   • E.g.

     function function1() {  
     // global  
     firstName = "test";
     }
     

2. Local

   • Must be declared inside a function with keyword var

   • Can NOT be accessed outside the function in which it is declared

   • E.g.

     function function1() {  
     // local  
     var firstName = "test";
     }
     

Function Alias

• Another way/name to call a function
• Syntax: var = ;
• E.g.

function function1() {
  console.log("inside function1");
}
// function alias
var myFunction1 = function1;
myFunction1();

Anonymous function

• Function without a name is called as anonymous function
• Syntax: var = function() { // body }
• E.g.

var multiply = function(p1, p2) {
  console.log("p1 * p2 = " + (p1 * p2));
}