多次遍历数组

// 示例代码：一次遍历完成多个操作
function processData(arr) {
    let sum = 0;
    let max = -Infinity;
    for (let i = 0; i < arr.length; i++) {
        sum += arr[i];
        if (arr[i] > max) {
            max = arr[i];
        }
    }
    return { sum, max };
}

// 示例代码：避免索引越界
function safeProcessData(arr) {
    let sum = 0;
    for (let i = 0; i < arr.length; i++) {
        if (i >= 0 && i < arr.length) {
            sum += arr[i];
        }
    }
    return sum;
}

// 示例代码：使用锁机制
const lock = new Lock();

function processDataWithLock(arr) {
    lock.acquire();
    try {
        let sum = 0;
        for (let i = 0; i < arr.length; i++) {
            sum += arr[i];
        }
        return sum;
    } finally {
        lock.release();
    }
}