Merge 2 arrays and sort it

mergeAndSortArr.js

// [1, 3, 6, 9,10, 2, 5] and [3,1,9,4,17,18,10]
// [1, 2, 3, 6, 9, 10, 17, 18]
//merge
//return one array sorted []

function getSortedArr(arr) {
	var a = [];
 	for (var i = 0; i < arr.length; i++) {
  	if (arr[i] > arr[i+1]) {
    	
    }
  }
}

function getSortedUniqueArr(a1, a2) {
	var a = [];
  var highestLength = a1.length > a2.length ? a1.length : a2.length;
	for (var i = 0; i < highestLength; i++) {
    var add1 = a1[i] < a2[i] ? a1[i] : a2[i];
    var add2 = a1[i] > a2[i] ? a1[i] : a2[i];
    !a.includes(add1) && a.push(add1);
    !a.includes(add2) && a.push(add2);
  }
  return getSortedArr(arr);
}