Array intersection

array-intersection.ts

function intersection(...lists) {
  const result = [];
  const resultLUT = {};

  for(let i = 0; i < lists.length; i++) {
    const currentList = lists[i];
    for(let y = 0; y < currentList.length; y++) {
      const currentValue = currentList[y];
      if(!resultLUT[currentValue]) {
        let existsInAll = true;
        for(let x = 0; x < lists.length; x++) {
          if(lists[x].indexOf(currentValue) === -1) {
            existsInAll = false;
            break;
          }
        }
        if(existsInAll) {
          result.push(currentValue);
        }
      }
    }
  }
  return result;
}