03. Inventory Programming Fundamentals Mid Exam

function exam(args) {
  const materials = args.shift().split(', ');

  const isFind = (matArr, material) => {
    const isMaterialFind = matArr.find((mat) => mat === material);

    return isMaterialFind;
  };

  const findPosition = (matArr, material) => {
    const index = matArr.indexOf(material);
    return index;
  };

  args.forEach((elelement) => {
    const [command, material] = elelement.split(' - ');
    const isFound = isFind(materials, material);


    switch (command) {
      case 'Collect':


        if (isFound === undefined) {
          materials.push(material);
        }
        break;
      case 'Drop':
        if (isFound !== undefined) {
          materials.splice(findPosition(materials, material), 1);
        }
        break;
      case 'Combine Items':
        const [oldItem, newItem] = material.split(':');
        const findOldEx = isFind(materials, oldItem);
        if (findOldEx !== undefined) {
          const oldItemIndex = findPosition(materials, oldItem);
          materials.splice(oldItemIndex + 1, 0, newItem);
        }
        break;
      case 'Craft!':
        console.log(materials.join(', '));
        break;

      case 'Renew':
        if (isFound !== undefined) {
          materials.splice(findPosition(materials, material), 1);

          materials.push(material);
        }
        break;
    }
  });

}