I have an array and would like to sort all but the last n elements.
For example, if the array is 10 elements long, would like elements 0 through 7 to be sorted while elements 8-9 are left in place.
var array = [5, 2, 6, 4, 1, 9, 3, 8, 7];
array = array.slice(0, 7).sort().concat(array.slice(7, 10));
// array is now [1, 2, 3, 4, 5, 6, 9, 8, 7]
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