JAVASCRIPT CL-2

Javascript anothor name is Eggmassscript
symble - es-6
bigint - es-11
new datatypes

variable diclaration
var , let , const
and without declatoin

they are two type of launage is there
1. Statically
2.Dynamically

STATIC TYPE
JAVA IS ALSO A STATIC TYPE
STRING name = abc;
name = xyz;
in java will reacin the value of the variable;
in static is must declaor the datatype

DYNMIC TYPE
JAVASCRIPT IS A DYNAMIC TYPE
student = abc;
without meansion the data types

html - is like builded house
css - is paint for the house
javascript - is a function like a electronic items

in javascript will replace the defecaties in var datatype
so using let and const

/block scope - peticular function only it's work
//global scope - program fully worked

print will use consol-log in javascript

goble scope and local scope

In javascript

 //block scope - peticular function only it's work
    //global scope -  program fully worked

    //without any keyword
    //var - function scope 
    //let - block level scope
    //const - block scope

function learnvariable() // name of the function
        {
            name = "vicky"; // data store
            console.log(name);//printstatement
        }
        learnvariable();//calling menthod

in javascript if the variable will called only called and will show in the output
if the output will show will use print statement outside of the function

if the function difind and function calling is now completed

why we doesn't use the var in javascript
for example code:

 function learnvariable()
        {
           var name = "vicky";
           var name = "main";
            console.log("inside",name);
        }
        learnvariable();
        console.log("outside",name);
output
    inside main // it's take a reassing in data
    outside vicky//outside calling will take the without reassing  data 

in var problem
1.it is not a block scope
2.redeclation defecaties or reassing issue
3.var will allow two time diclare the var
so ,this proble will solve to use let

    function learnvariable()
        {
           let name = "vicky";
            console.log("inside",name);
        }
        learnvariable();
        console.log("outside",name);

in this function will only allow one time declear the let

will scerate the progrmaimg launage
1.compiled prg
2.interpretor prg
will using const will never change or not reasing the value of variable

function learnvariable()
        {
           const Username = 10;
            usernamr =20; // its shows a error 
            console.log("inside",Username);
        }
        learnvariable();
        console.log("outside",Username);

next will find the datatype of the vale

let i = "hii";
        console.log(typeof i);//if find the type of the datatype using typeof
output:
       string