snippet.js

/**
 *
 * @param {string} key - the unique key on each object
 * @param {Array} arrays - the arrays to be iterated over
 * @returns an array of unique objects between all the passed arrays
 */
function getUniqueObjectsFromMultipleArrays(key, ...arrays){
  // Make a place to store everything
  const objectMapper = new Map();
  // filter out anything not an array
  const filteredArrays = arrays.filter((el)=>Array.isArray(el));
  // Set up our values. uniqueSet will evenutally be a collection of unique ids.
  let currentArray, uniqueSet;
  // if we pop from arrays and nothing is left, this will be undefined, and will end.
  while(currentArray = filteredArrays.pop()){
    // Let's collect all the unique IDs in our current array.
    const currentIds = new Set();

    // loop over everything
    currentArray.forEach((el)=>{
      // our unique key
      const id = el[key];
      // add our id
      currentIds.add(id);
      // store our object
      objectMapper.set(id, el);
    })
    // we assign the uniqueSet to be the interesction of uniqueSet and currentIds. if uniqueSet is undefined, give us everything.
    uniqueSet = currentIds.intersection(uniqueSet ?? currentIds);
  }
  
  // spread into an array and get our objects.
  return [...uniqueSet].map((id)=>objectMapper.get(id));
}


resolve(getUniqueObjectsFromMultipleArrays(
  "id", 
  filter.title && byTitle, 
  filter.duration && byDuration, 
  filter.ingredient && byIngredient
));