write a loop which prints out an array backwards in javascript

You can print out an array backwards in Javascript by using a for loop and starting from the last index of the array, decrementing the index until you reach the first element. Here's an example:

index.tsx
let arr = [1, 2, 3, 4, 5];

for(let i = arr.length - 1; i >= 0; i--){
   console.log(arr[i]);
}
96 chars
6 lines

This will output:

index.tsx
5
4
3
2
1
10 chars
6 lines

In the loop, the i variable is initialized to the last index of the array using arr.length - 1. The loop then continues as long as i is greater than or equal to 0, and decrements i using i-- on each iteration. Finally, inside the loop, we can access the array elements using the current value of i with arr[i].

In this example, we're using console.log() to print out each array element to the console. You can modify the loop to do whatever you need with the array elements.