数组拍平2.html

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    <title>数组拍平（二）</title>
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    <h3>编写一个 JavaScript generator 函数，接受一个仅包含数字的 多维数组 ，返回一个迭代器，可以遍历得到它拍平以后的结果。例如：</h3>
    <pre>
const numbers = flatten2([1, [[2], 3, 4], 5])
numbers.next().value // => 1
numbers.next().value // => 2
numbers.next().value // => 3
numbers.next().value // => 4
numbers.next().value // => 5
    </pre>
    <script>
        function* flatten2(arr) {
            if (!arr || arr.length === 0) return '';
            const arr2 = arr.toString().split(',').map(Number)
            for (let i = 0; i < arr2.length; i++) {
                yield arr2[i]
            }
        }
        const numbers = flatten2([1, [[2], 3, 4], 5])
    </script>
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