Clear all values without delete properties in object

clear_all_values_without_delete_props.js

function clearAllValues(data, byTypeOf = false) {

    let clearValuesTypeOf = {
        boolean: false,
        number: 0,
        string: '',
    }

    // clear array if data is array
    if (Array.isArray(data)) {
        data = [];
    } else if (typeof data === 'object' && data !== null) {
        // loop object if data is object
        Object.keys(data).forEach((key, index) => {
            // clear array if property value is array
            if (Array.isArray(data[key])) {
                data[key] = [];
            } else if (typeof data[key] === 'object' && data !== null) {
                data[key] = this.clearAllValues(data[key], byTypeOf);
            } else {
                // clear value by typeof value if second parameter is true
                if (byTypeOf) {
                    data[key] = clearValuesTypeOf[typeof data[key]];
                } else {
                    // value change as null if second parameter is false
                    data[key] = null;
                }
            }
        });
    } else {
        if (byTypeOf) {
            data = clearValuesTypeOf[typeof data];
        } else {
            data = null;
        }
    }

    return data;
}

let object = {
    name: 'Semih',
    lastname: 'Keskin',
    brothers: [
        {
            name: 'Melih Kayra',
            age: 9,
        }
    ],
    sisters: [],
    hobbies: {
        cycling: true,
        listeningMusic: true,
        running: false,
    }
}

console.log(object);
// output before changed: {"name":"Semih","lastname":"Keskin","brothers":[{"name":"Melih Kayra","age":9}],"sisters":[],"hobbies":{"cycling":true,"listeningMusic":true,"running":false}}

let clearObject = clearAllValues(object);

console.log(clearObject);
// output after changed: {"name":null,"lastname":null,"brothers":[],"sisters":[],"hobbies":{"cycling":null,"listeningMusic":null,"running":null}}

let clearObject2 = clearAllValues(object);

console.log(clearObject2);
// output after changed by typeof: {"name":"","lastname":"","brothers":[],"sisters":[],"hobbies":{"cycling":false,"listeningMusic":false,"running":false}}