如何删除数组中当前索引前面的项？

要删除数组中当前索引前面的所有项，可以使用多种编程语言中的数组操作方法。以下是几种常见编程语言中的实现方式：

JavaScript

function removeItemsBeforeIndex(arr, index) {
  return arr.slice(index);
}

// 示例
let array = [1, 2, 3, 4, 5];
let index = 3;
let newArray = removeItemsBeforeIndex(array, index);
console.log(newArray); // 输出: [4, 5]

Python

def remove_items_before_index(arr, index):
    return arr[index:]

# 示例
array = [1, 2, 3, 4, 5]
index = 3
new_array = remove_items_before_index(array, index)
print(new_array)  # 输出: [4, 5]

Java

import java.util.ArrayList;
import java.util.List;

public class Main {
    public static List<Integer> removeItemsBeforeIndex(List<Integer> list, int index) {
        return new ArrayList<>(list.subList(index, list.size()));
    }

    public static void main(String[] args) {
        List<Integer> list = new ArrayList<>();
        list.add(1);
        list.add(2);
        list.add(3);
        list.add(4);
        list.add(5);
        int index = 3;
        List<Integer> newList = removeItemsBeforeIndex(list, index);
        System.out.println(newList); // 输出: [4, 5]
    }
}

C#

using System;
using System.Collections.Generic;

public class Program
{
    public static List<int> RemoveItemsBeforeIndex(List<int> list, int index)
    {
        return list.GetRange(index, list.Count - index);
    }

    public static void Main()
    {
        List<int> list = new List<int> { 1, 2, 3, 4, 5 };
        int index = 3;
        List<int> newList = RemoveItemsBeforeIndex(list, index);
        Console.WriteLine(string.Join(", ", newList)); // 输出: 4, 5
    }
}