Search key and return value in nested object

Question

Lets say my object looks like the below. Its a mix of different arrays and parents, no hierarchical order. e.g.

\"person\": {
\"id\": 12345,
\"name\": \"John Doe         


        

Answer 1

 returnValuesForAttribute = (attr) => {
    let mobile = {};
    let index = 0;
    Object.values(person).map(first_level => {
        if (Array.isArray(first_level)) {
            first_level.map(el => {
                if (Object.keys(el).includes(attr)) {
                    mobile[index] = el[attr];
                    index++;
                }
                Object.values(el).map(second_level => {
                    if (typeof second_level === 'object' && second_level[attr]) {
                        mobile[index] = second_level[attr];
                        index++;
                    }
                })
            })
        }
    });
    return mobile;
}
returnValuesForAttribute('mobile');

Output: {0: "877-123-1234", 1: "877-123-1234", 2: "877-123-1234", 3: "877-123-1234"}