类型[...number[]，string]在弹出最后一个元素后保持不变

type NumberStringArray = [...number[], string];

function processArray(arr: NumberStringArray): void {
    const numbers = arr.slice(0, -1);
    const lastElement = arr[arr.length - 1];
    console.log("Numbers:", numbers);
    console.log("Last Element:", lastElement);
}

const validArray: NumberStringArray = [1, 2, 3, "end"];
processArray(validArray); // 输出: Numbers: [1, 2, 3] Last Element: end

const invalidArray: NumberStringArray = [1, "middle", 3, "end"]; // 编译错误

function popLastElement(arr: NumberStringArray): [number[], string] {
    const numbers = arr.slice(0, -1);
    const lastElement = arr[arr.length - 1];
    return [numbers, lastElement];
}

const originalArray: NumberStringArray = [1, 2, 3, "end"];
const [newArray, poppedElement] = popLastElement(originalArray);

console.log("Original Array:", originalArray); // 输出: Original Array: [1, 2, 3, "end"]
console.log("New Array:", newArray); // 输出: New Array: [1, 2, 3]
console.log("Popped Element:", poppedElement); // 输出: Popped Element: end