JAVA SCRIPT

what is javascript

*This is front end programming launage
*There are two type of process is there in full stack

1.frontend

1. 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
2. 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

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