Slice and Splice arr[i] question

why is arr1[i] when added to the add area in splice returned as 3,2,1 instead of 1,2,3 ?

  **Your code so far**
function frankenSplice(arr1, arr2, n) {
let nArr =arr2.slice();
for (let i = 0; i<arr1.length; i++){
return nArr

console.log(frankenSplice([1, 2, 3], [4, 5, 6], 1));
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Challenge: Slice and Splice

Link to the challenge:

Because arr1 is an array with [1,2,3] and i is counting up from 0. So splice is telling it to insert items from arr1 starting from index 0-2 at the index of n. So if you have your loop count backwards it should work.