JAVASCRIPT
what is javascripe?
*This is front end programming launage
*There are two type of process is there in full stack
- 1.frontend
- 2. backend *In backend can store the data in storeage in database and retrive the data in database .and uses to retrive the data in 1.trt , 2. pdf, 3 xls this type of formate to share the data to frontend process
*So the frontend developer can know the html and css to create the table using html and css
*We using prgram launage to learing for data handling only.
there are three type of application is there
    1. mobile application
    2.web application
    3.system application
Data:
    It like a information( for example : name ,genter,age,marital status)
    name = string
    age= number (interger)
    gender= string
    heignt= decemale number(float)
    maritale status = true or false (boolen)
    contant = number (big interger or long)
in javascript has 8 datatype
    1.STRING - more then one chareter to write in javascripe using "" and ''also 
    2.NUMBER - number is all number 
    3.BIGINT - long number 
    4.UNDEFINDED - without using var,let,const is called undefind
    5.NULL - without store the value is call null
    6.SYMBLE -(TBD)
    7.OBJECT -Collection of datas and datatype
    8.BOOLEAN - true or false
variables
 it a lable of data (for example:)
     kumar - name = kumar is a data and name is a variable and also called identifier 
    in javascript to diclare the variable to use the key words
    1.LET
    2.VAR
    3.CONST
example :
let number = 25;
keyword - variable - assing oprator - value or data ;
in java will mention the datatype is compalsory . but in javascript data type menstion is not manitory 
    for example: in java 
            string name = "kumar"; mention the datatype is manitory
        IN javascript
            let name = "kumar"; datatype is not manitory
 

 
    
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