Symbol.iterator on number prototype

NumberCustomIterator.js

const { log } = console;

Number.prototype[Symbol.iterator] = function () {
    let i = 0;
    const end = this;
    return {
        next() {
            return {
                value: i++,
                done: i > end,
            };
        },
    };
};

// for-of
for (i of 2) {
    log(i);
}

// array-destructuring
const [, a] = 10;
log(a)

// spread operator
const a = [...10]
log(a)


// rest parameters
function test(...a){
    log(a)
}

test(...3)