{}
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//logic
// by two pointer approach
const arr = [1,2,3,4];
let i = 0;
let j = arr.length-1;
while(i<j){
temp =arr[i];
arr[i] = arr[j];
arr[j] = temp;
i++;
j--;
}
// for(x in arr){
// console.log(x); // it prints the keys(index) in the array not the values.
// }
// for(let x of arr){
// console.log(x); // it will print the values in the array.
// }
// for(let k = 0; k<arr.length;k++){ // it is also one method of printing the array.
// console.log(arr[k]);
// }
// console.log(arr.join(" ")); //print the arr with sapces
// if array need to print in the same line :
// let result = "";
// for(let x of arr){
// result+=x+ " ";
// }
// console.log(arr.join(" ")); //another way to find the arr in same line
console.log(...arr); //using spead operator