forloop.js

for (let i=0;i<=10;i++) // post increment// initilization // condition//increment
{
    console.log(i);
    
}
///////////////////////////
let x=0;
for (let i=0;i<=10;i++)
{
    x+=i;  //i=0 x=0 // 0+1=1
    console.log(x);// print all values of x
    
}
//////////////////////////////
let x=0;
for (let i=0;i<=10;i++)
{
    x+=i;  //i=0 x=0 // 0+1=1   
}
console.log(x);  // print last value of x 
////////////////////////

 let arr=["one","two","three","four","five"]
 for (let i=0;i<arr.length;i++)
 {
    console.log(arr[i]);
    
 }
///////////////
 let str1="reena";
 for (let i=0; i<str1.length;i++)
 
    {
console.log(str1[i]);// to print each value of string 

    }
/////////////////////////
    let str2="reena";
    let newstr=""
 for (let i=0; i<str2.length;i++)
 
    {
        newstr=newstr+str2[i];
// to print horizontal
    }
console.log(newstr);


// reverse of string using loop
let str3="reena";
let newstr1=""
for (let i=str3.length-1;i>=0;i--)
{
    newstr1=newstr1+str3[i]
}
console.log(newstr1);


// while loop only condition satisfy
// it runs until condition satisfy

let one=1;

while(one<=10)
{
    console.log(one);
    one++
}

let num=[1,2,3,4,5,9]
let i=0;
while(num[i]!=5)
{
    console.log(num[i]);
    i++
}
///////////////////////////////
// do while loop
let z=1;

do{
    console.log(z);;
    z++;
}
while(z<=10)

// if condition fail it executes atleast once 
let y=1;

do{
    console.log(y);;
    y++;
}
while(y>10)




    ////////////// for in loop use in key word iterates object and its keys

    let obj={
        name:"reena",age:10
    }

    for (let a in obj)
    {
        console.log(a,"--",obj[a]); 
    }

    // for of loop use string and arrays and itsiterates  values

    let pet=["dog","rabbit","parrot","cat"]
    for (let a of pet)
    {
        console.log(a);
        
    }
////  for each loop  arrays iterates only value and index

let numnum=["one","two","three","four"]
numnum.forEach((val,ind,arr)=>   // pass val ind and arr
{
    console.log(val,ind,arr);
    
})