如何在不循环每一项的情况下循环集合？

const collection = [1, 2, 3, 4];
const processedCollection = collection.map(item => item * 2);
// processedCollection: [2, 4, 6, 8]

const collection = [1, 2, 3, 4];
collection.forEach(item => {
    console.log(item);
    // 其他操作
});

class MyIterator:
    def __init__(self, collection):
        self.collection = collection
        self.index = 0
    
    def __iter__(self):
        return self
    
    def __next__(self):
        if self.index >= len(self.collection):
            raise StopIteration
        item = self.collection[self.index]
        self.index += 1
        return item

collection = [1, 2, 3, 4]
my_iterator = MyIterator(collection)
for item in my_iterator:
    print(item)
    # 其他操作