I do not understand, why array “fr” return empty array?
function frankenSplice(arr1, arr2, n) {
var a = arr1;
var b = arr2;
var fr =[];
return fr = b.splice(n, 0, a);
}
frankenSplice([1, 2, 3], [4, 5, 6], 1);
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Link to the challenge: