Dot walk object until last property reached

dotWalkObject_es5.js

 /**
     * Walks through an object using dot notation or an array of properties. This could be replaced by option chaining in ECMA2021
     * @param {object} obj - The object to walk through.
     * @param {string | string[]} props - The dot notation string or array of properties to traverse.
     * @returns {*} - The value of the property at the end of the traversal, or undefined if not found.
     * @throws {Error} - Throws an error if the arguments are invalid.
     * @private
     */
    function _dotWalkObject(obj, props) {
        var propsIsArray = Array.isArray(props);
        if (typeof obj !== "object" || (!propsIsArray && typeof props !== 'string' )) {
            throw new Error("_dotWalkObject: Invalid arguments.");
        }
       
        props = propsIsArray ? props : props.replace(/\[(\d+)\]/g,".$1").split('.').filter(Boolean);
        return props.reduce(function(acc, key) {
            return acc && acc.hasOwnProperty(key) ? acc[key] : undefined;
        }, obj);
    }