Usage of return in loops in JavaScript

The fact that return is located inside the loop may not always be a mistake. In the following example, a function is made that determines how many first elements of an array must be added so that the sum becomes greater than or equal to 10:

javascriptfunction func(arr) {
  let sum = 0;
  
  for (let i = 0; i < arr.length; i++) {
    sum += arr[i];
    
    // If the sum is greater than or equal to 10:
    if (sum >= 10) {
      return i + 1; // exits the loop and the function
    }
  }
}

let res = func([1, 2, 3, 4, 5]);
console.log(res);

And in the following example, a function is made that calculates how many integers, starting from 1, must be added so that the result is greater than 100:

javascriptfunction func() {
  let sum = 0;
  let i = 1;
  
  while (true) { // an infinite loop
    sum += i;
    
    if (sum >= 100) {
      return i; // the loop runs until it exits here
    }
    
    i++;
  }
}

console.log( func() );