how to get the maxvalue from an array using javascript code example

Example 1: javascript max array

var values = [3, 5, 6, 1, 4];

var max_value = Math.max(...values); //6
var min_value = Math.min(...values); //1

Example 2: 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]));