javascript largest number in array

1const max = arr => Math.max(...arr);

1function findHighestNumber(nums) {
2	
3	let inputs = nums.filter((val, i) => nums.indexOf(val) === i)
4	let max = Math.max(...nums);
5	let min = Math.min(...nums);
6  
7   return max + (-min);
8}
9
10console.log(difference([1, 7, 18, -1, -2, 9]));