Notes.txt

 Functions :- set of statements that perform specific tasks. 
 syntax:-
 function functionname(parameter){
    //set of statements
 }
 //function call 
 functionname()

 =>function will always have return
return
=> to reduce the number of time code get executed
=> one function will always have only one return

/*without function
var a =10;
var b =20;
var c = a+b;
console.log(c);
*/
/*with function but with no return
function add(a,b){
  console.log(a+b);
}
function sub(a,b){
console.log(a-b)
}
add(10,20)
sub(20,10)
*/

/* with multiple returns
function arithmetic (a,b){
    return [a+b,a-b,a*b,a%b]
}
console.log(arithmetic(50,20));

function arithmetic1 (a,b){
    return {
        sum: a+b,
        difference :a-b,
        product: a*b,
        reminder: a%b
    }
}
console.log(arithmetic1(50,20));
*/


 Types of Functions:-
   1.Normal Functions
   // Print even numbersin an array[1,2,3,4,5,6,7,8,9,10]
var result =[];
function even(arr){
    for(var i=0;i<=arr.length-1;i=i+1)
    {
        if(arr[i]%2===0){
            result.push(arr[i])
        }
    }
    return result
}
console.log(even([1,2,3,4,5,6,7,8,9,10]))

2.Annonyomus Function
   var result =[];
var a = function (arr){
    for(var i=0;i<=arr.length-1;i=i+1)
    {
        if(arr[i]%2===0){
            result.push(arr[i])
        }
    }
    return result
}
console.log(a([1,2,3,4,5,6,7,8,9,10]))

3.IIFE Function
   var result = [];
(function (arr){
    for(var i =0; i<=arr.length-1;i=i+1){
        if(arr[i]%2===0){
            result.push(arr[i])
        }
    }
    console.log(result);

4.Arrow Function
var result =[];
var even = (arr) =>{
    for(var i=0;i<=arr.length-1;i=i+1)
        {
            if(arr[i]%2===0)
            {
                result.push(arr[i])
            }
        }
        return result
}
console.log(even([1,2,3,4,5,6,7,8,9,10]))


 Lopping
1.while lopping
    while(condition){
    statement
  }

  example:- 
   /* while loop
let a = 0;
let b = 0;
while (a<3){
    a++;
    b += a;
}
*/
/* Infinite loop example it is a bad approach
while (true){
    console.log("Hello World");
    
}

2.do while loop
   syntax:- 
   do {
          statement
   }
   while (condition);
   
   example:- 
   /* Do while
let a =0;
do{
    a += 1;
    console.log(a);
    
}while(a<5)

   3.for loop
   4.for of loop
   5.for in loop
   6.for each loop