Inspect object and return getter methods in console.table

inspect.js

var inspect = function(ctrl, prototypeLevel = 1) {
    let output = [];
    let level  = prototypeLevel;

    // local auxiliary helper
    const _fillDictionary = (subObj, depth, originalObj = subObj) => {
        Object.keys(subObj).forEach(key => {
            // only consider 'getter' and catch any error (such as mandatory parameters)
            if (key.startsWith('get') && typeof originalObj[key] === 'function') {
                try {
                    output.push({ depth: depth, key: key, value: originalObj[key]() });
                } catch(error) {
                    console.error(key, originalObj[key]);
                }
            }
        });
    };

    // Object itself
    ctrl && _fillDictionary(ctrl, 0);

    // And its chain of prototype
    let parent = ctrl;

    while (level > 0 && parent) {
        let proto = (Object.getPrototypeOf && Object.getPrototypeOf(parent)) ||
                    parent.__proto__;
        let depth = prototypeLevel - level + 1;

        proto && _fillDictionary(proto, depth, ctrl); 

        // update loop
        level--;
        parent = proto;
    }

    // Sorting
    // output.sort((a, b) => a.key.localeCompare(b.key));
    output.sort((a, b) => a.depth - b.depth ||          // sort by depth
                          a.key.localeCompare(b.key));  // then by key

    (console.table) ? console.table(output)
                    : console.log(output);
};