Javascript find index of missing elements of two arrays

Question

I have the following JavaScript where I have some lists:

var deleteLinks = $(\".remove-button .remove-from-cart\");
deleteLinks.on(\'click\', function(ev){
            


        

Answer 1

Assuming that you have unique elements in an array A and only one occurrence in the array B. We can just use set to add all the elements of array A and remove the elements from the set when you iterate over Array B. Use findIndex to look up for elements remaining in the set.

const a = [1,2,3,4,5];
const b = [2,1,5,4];
let set = new Set();
a.forEach(ele => set.add(ele));
b.forEach(ele => {
  if(set.has(ele)){
    set.remove(ele);
  }
});
let res = [];
for(let s of set) {
  if(a.findIndex(s) !== -1) {
    res.push({
     arr:  a,
     pos: a.findeIndex(s)
    });
  }else {
    res.push({
     arr:  b,
     pos: b.findeIndex(s)
    });
  }
}

The res array contains the index and the array in which the element is present.