JS中数字原型的自定义迭代器 [英] Custom Iterator for Number Prototype in JS

问题描述

最近我了解了JS迭代器，用于中的（of）循环。因为在JS中，甚至原语都有原型，我想知道是否可以扩展Number原型，以便以下是一个有效的表达式：

Recently I learned about JS iterators, beeing used in a for( of ) loops. Since in JS even primitives have a prototype, I wondered if it is possible to extend the Number prototype so that the following would be a valid expression:

for(let i of 10) console.log(i); //0 1 2 3 4 5 6 7 8 9

显然这只适用于整数，但是有没有办法实现这个？

Obviously this would only work for integers, but is there a way to implement this?

希望有，但我自己无法创建这个，因为我是JS的这一部分的新手......

Hopefully there is, but I wasn't able to create this myself since I'm new to this part of JS...

推荐答案

你可以采取 Generator / en-US / docs / Web / JavaScript / Reference / Global_Objects / Symbol / iteratorrel =nofollow noreferrer> Symbol.iterator 作为<的原型数字。

Number.prototype[Symbol.iterator] = function* () {
    for (var i = 0; i < this; i++) {
        yield i;
    }
};

console.log([...10]);

.as-console-wrapper { max-height: 100% !important; top: 0; }

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