Using recursive function to iterate over nested object, returns undefined

Question

I need to iterate over a nested function and find the sub-object that has the same key as I want. here is the code:

 const searchObject = (obj, label) => {
        const object = Object.keys(obj).forEach(key => {
            if(label === key) {
                return obj[key];
            } else if(typeof obj[key] === "object") {
                const value = searchObject(obj[key], label);
                if(value) return value;
            }
        });
        return object;
    };

I searched a lot and I found many people are recommending this way but I dont know why I get undefined when I log console.log(searchObject(obj, "Intercept")). (I am using React framework)

One thing to watch out for is that null also has a type of 'object', so you may need to check for that as well. — Abe
– Abe, Commented Apr 24, 2020 at 4:29
Why don't you post your data object here, at least a sample? — lshettyl
– lshettyl, Commented Apr 24, 2020 at 12:13

Nafis Islam · Accepted Answer · 2020-04-24 04:42:00Z

1

forEach returns undefined.

 const searchObject = (obj, label) => {
        var object = {}
        Object.keys(obj).forEach(key => {
            if(label === key) {
                object = obj[key];
            } else if(typeof obj[key] === "object") {
                const value = searchObject(obj[key], label);
                if(value) object = return value;
            }
        });
        return object;
    };

edited Apr 24, 2020 at 4:42

answered Apr 24, 2020 at 3:58

Nafis Islam

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2 Comments

Samira Arabgol Over a year ago

unfortunately map() did not solve the problem. most of the time it returns arrays of undefined and sometimes it has the object I am looking for. But this should not be the right way.

ggorlen Over a year ago

You probably want Array#find then. Can you post your input and expected output as a minimal reproducible example?

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