ValueScript/inputs/passing/exceptions/revertSmallQueue.ts

//! test_output([1,3,"SmallQueue is already full"])

export default function () {
  let a = new SmallQueue(["item1"]);
  let b = new SmallQueue(["item2", "item3", "item4"]);
  let errors: Error[] = [];

  try {
    const item = a.pop();
    b.push(item);
  } catch (e) {
    errors.push(e);
  }

  return [
    a.items.length,
    b.items.length,
    errors.map((e) => e.message).join(","),
  ];
}

class SmallQueue<T extends {}> {
  constructor(public items: T[]) {
    if (items.length > 3) {
      throw new Error(`${items.length} is too many items for SmallQueue`);
    }
  }

  pop(): T {
    const item = this.items.pop();

    if (item === undefined) {
      throw new Error("Cannot pop empty queue");
    }

    return item;
  }

  push(item: T) {
    if (this.items.length >= 3) {
      throw new Error("SmallQueue is already full");
    }

    this.items.push(item);
  }
}