Looping through array vs. resetting array

[atenger]

In Lesson 4, Basic Solidity: For Loop and Resetting An Array (at around approx 4:40:00), Patrick shows us how to first loop through an array to reset all the values we had previously set to 0. And then after the for loop, he shows us how to reset an array by redeclaring it as empty.

In real world, do you really need that loop or wouldn't you just reset the array?

for (uint256 funderIndex = 0; funderIndex < funders.length; funderIndex=funderIndex + 1){
       address funder = funders[funderIndex]; 
       addressToAmountFunded[funder] = 0;
}
//reset the array
funders = new address[](0); // new array with 0 objects // WHY IS THE LOOP NEEDED IF WE ARE DOING THIS?

[alymurtazamemon]

@atenger

Patric used for loop for resetting the mapping's each address value to 0. And after for loop, he reset the Array.

[atenger]

Thanks for the reply!
I was wondering what happens if you reset an array without going through the loop first? I assumed it would end with the same result? I couldn't tell if the looping was actually necessary or just being used to demonstrate how to loop through an array. I'll tinker and see if I can figure this out on my own. :)