如何动态扩展单层嵌套哈希? [英] How to expand single level nested hashes on the fly?

问题描述

我有一个对象，其中一些键嵌套在单个级别的哈希值中.在此示例中，仅嵌套b.

I have an object where a few of the keys are nested single level hashes. In this example only b is nested.

const j = {
  a: 'A',
  b: {
    bb: 'BB',
    bbb: 'BBB',
    },
  c: 'C'
};

问题

我正在寻找一种遍历对象的方法，如果键是嵌套对象，则改为打印其键.

Question

What I am looking for is a way to loop over the object and if a key is a nested object, then print its keys instead.

a
bb
bbb
c

有人知道怎么做吗?

推荐答案

您可以递归执行此操作:

You can do this recursively:

function printKeys(obj) {
    for (const [key, val] of Object.entries(obj)) {
        if (typeof val === "object") {
            printKeys(val);
        } else {
            console.log(key);
        }
    }
}

如果最多只有一层嵌套，则@blex的答案可能是更好的答案.

If you only have one level of nesting at most, @blex's answer is probably the better one.

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