传递函数作为参数

function processArray(arr, callback) {
  for (let i = 0; i < arr.length; i++) {
    callback(arr[i]);
  }
}

function printElement(element) {
  console.log(element);
}

const array = [1, 2, 3, 4, 5];
processArray(array, printElement);

def process_list(lst, callback):
    for item in lst:
        callback(item)

def print_item(item):
    print(item)

my_list = [1, 2, 3, 4, 5]
process_list(my_list, print_item)

interface Callback {
    void execute(int number);
}

class Processor {
    void processArray(int[] array, Callback callback) {
        for (int number : array) {
            callback.execute(number);
        }
    }
}

class Printer implements Callback {
    public void execute(int number) {
        System.out.println(number);
    }
}

public class Main {
    public static void main(String[] args) {
        int[] array = {1, 2, 3, 4, 5};
        Processor processor = new Processor();
        Callback callback = new Printer();
        processor.processArray(array, callback);
    }
}