DAY -8
HOW TO CHANGE THE WHILE LOOP TO FOR LOOP FOR UNDERSTANDING
SAMPLE WHILE LOOPING CODE:
let i=1;
        while(i<=5){
            console.log(i);
            i++
        }// OUTPUT 1 2 3 4 5
SAMPLE FOR LOOPING CODE:
for(j=0;j<=5;j++){
            console.log(j);
        } //OUTPUT : 0 1 2 3 4 5
NEXT WILL DICUSS 
    1.ARROW FUNCTION
    2.ARRAY
    3.FOREACH
ARROR FUNCTION:
NORMAL FUNCTION CODE :
 syntax for function
function functionname( variable){
        log.();
    }
    functionname(value)
NOW , WE CHANGE THE FUNCTION TO ARROW FUNCTION
syntax for arrow function
()=>{ 
        log.("hi"); 
       }
IN ARROW FUNCTION WILL WRITE THE ONE LINE CODE curly braces IS NOR MANITAOR
SAMPLE CODE :
()=> log.("HI");
1.WHY WILL USE NARROW FUNCTION ?
    * NORROW FUNCTION ONLY USED TO SMILIFY THE FUNCTION ONLY.
2.THEN WHY CALL ARROW FUNCTION ?
     * CREAT ONE VARIABLE TO CALL THE ARROW FUNTION 
Syntax:
const variableName = () => console.log("HI");
sample code
//arrow function
        const display = () => console.log("hi");
        display() //  OUTPUT : hi
DIFFERENT BETWEEN HOISTED AND NON- HOISTED
    * FUNCTION IS CALLED HOISTED .BECAUSE BEFORE DECLARECTION WILL USES THE FUNCTION NAME IS CALL HOISTED 
    * VARIABLES IS CALLED A NON-HOISTED .BECAUSE BEFORE DECLARECTION IS NOT WORKING .BECAUSE IF  DECLARE THE VARIABLE NAME THEN ONLY THE MEMORY WILL CREATE SO VARIABLE IS CALLED NON-HOISED
 EXAMPLE CODE FOR NON-HOISTED
display() // VARIABLE
    const display = () => console.log("hi"); // IF WE CALLED THE VARIABLE BEFORE MENCTION IS ACCORED ERROW 
ARRAY:
- SET OF DATA STORED IN A SINGLE VARIABLE AND THE DATA WILL STORE IN A INDEX FORM . AND ARRAY WILL 0TH INDEX WHY WE WILL YOU ARRAY ?
- IN REAVLE WAORD WE STORE THE ONE STUDENT EXAM MARKS TAM = 87 ENG = 77 MATH = 89 SCI = 98 SS = 88
- IN THIS SUTIVATION WE WILL CERATE A MULTIPLE VARIABLES . SO SOVE THIS ISSUE TO WE USE THE ARRAY . SO USING ARRAY SET OF PERTICULR DATA IN A STORED IN A SINGLE VARIIABLE
EXMPLE:
        MARKS = [ 87 77 89 98 88] // THIS IS CALLED ARRAY
IN JAVASCRIPT WILL WRITE THIS CODE
const marks = [ 87 77 89 98 88] // 
SAMPLE CODE :
const marks = [2,3,4,5,6];
        console.log(marks[3]);// OUTPUT : 5
        console.log(marks);//Array(5) [ 2, 3, 4, 5, 6 ]
        console.log(marks);// OUTPUT : Array(5) [ 2, 3, 4, 5, 6 ]
        // reassin the value of index 3 
        marks [3]= 45;// reassin the value 
        console.log(marks);// outpur : Array(5) [ 2, 3, 4, 45, 6 ]
 

 
    
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