let dinnerFood = ['salad', 'soup', 'casserole'];
let breakfastFood = ['omelet', 'pancakes', 'fruit'];

console.log(`From array:  ${breakfastFood}`);
console.log(`To array:  ${dinnerFood}`);

function moveItem(itemToMove , fromArray, toArray) {
  if (fromArray.includes(itemToMove) && !toArray.includes(itemToMove)) {
    // we know the item is in the starting array
    function isItem(currentItem) {
      // if the two items are the same
      // then return the item to the caller
      return itemToMove === currentItem;
    }

    let theItem = fromArray.find(isItem);

    // ['salad', 'soup', 'casserole']
    // ['salad', 'casserole']
    // let start = dinnerFood.slice(0, 1) => ['salad']
    // let end   = dinnerFood.slice(2) => ['casserole']
    let index = fromArray.indexOf(itemToMove);
    let start = fromArray.slice(0, index);
    let end   = fromArray.slice(index + 1);

    fromArray = start.concat(end);
    toArray.push(theItem);
    return true
  }
  
  return false;
}

moveItem('pancakes', breakfastFood, dinnerFood);

console.log(`From array:  ${breakfastFood}`);
console.log(`To array:  ${dinnerFood}`);