[Javascript] Create a Custom Iterator for Any Array

时间：2019-12-28 13:31:41 阅读：85 评论：0 收藏：0 [点我收藏+]

标签：bsp hat using sed const ide sso read ret

Using Symbol.iterator, you can create custom iterators that can be used inside of for loops and Array spreads. This lesson walks you through creating a function to create iterators from arrays that you pass into the function.

const abcs = ["A", "B", "C"]

const numbers = [1, 2, 3]

const createReverseIterator = array => ({
    [Symbol.iterator]() {
        let i = array.length
        return {
            next: () => ({
                value: array[--i],
                done: i < 0
            })
        }
    }
})


for (let value of createReverseIterator(numbers)) {
    console.log(value)
}

标签：bsp hat using sed const ide sso read ret

原文地址：https://www.cnblogs.com/Answer1215/p/12111188.html

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