find highest number in array javascript
function findHigestNumber(nums) {
let inputs = nums.filter((val, i) => nums.indexOf(val) === i)
let max = inputs.length - 1;
let min = 0;
for(let i = 0; i < inputs.length; i++) {
if(inputs[i] > max) max = inputs[i];
if(inputs[i] < min) min = inputs[i];
}
return max + (-min);
}
console.log(difference([1, 7, 18, -1, -2, 9]));