const list1 = [3, 15, 25, 30, 45, 50, 55, ]
const list2 = [10, 20, 22, 28, 33, 35, 40, 98, 99 ]
let newList = new Array()
let lista = 0
let listb = 0
for (let i = 0; i < list1.length + list2.length; i++) {
if(list2[listb] == undefined){
list1[lista] &&
newList.push(list1[lista])
lista ++
}
if(list1[lista] == undefined){
list2[listb] &&
newList.push(list2[listb])
lista ++
}
if (list1[lista] < list2[listb] || list1[listb] == undefined) {
list1[lista] &&
newList.push(list1[lista])
lista ++
}else{
list2[listb] &&
newList.push(list2[listb])
listb ++
}
}
console.log("Added final", newList)
