what is a for of loop used for in javascript code example

Example: for loop js

let arr = [];
for(let i = 0; i <= 10; i++){
arr[i] = Math.round(Math.random() * 10);
}
•	Result: [3, 1, 1, 2, 3, 9, 5, 6, 6, 8, 5] 
•	                        Or
let arr = [];
for(let i = 0; i <= 10; i++){
arr[i] = Math.trunc(Math.random() * 10);
} 
Result[7, 6, 0, 2, 4, 8, 7, 5, 5, 6, 5]